diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsSummaryReporter.cs b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsSummaryReporter.cs
index b8f8ab6858..127b9e1e41 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsSummaryReporter.cs
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsSummaryReporter.cs
@@ -19,7 +19,7 @@ namespace Microsoft.Testing.Extensions.AzureDevOpsReport;
 
 internal sealed class AzureDevOpsSummaryReporter : IDataConsumer, ITestSessionLifetimeHandler, IOutputDeviceDataProducer
 {
-    private const string DefaultSummaryFileNameFormat = "azdo-summary-{0}.md";
+    private const string DefaultSummaryFileNameFormat = "azdo-summary-{0}-{1}-{2}.md";
     private const string FullyQualifiedNamePropertyKey = "vstest.TestCase.FullyQualifiedName";
     private const int MaxSlowestTests = 10;
     private const int MaxTopFailingClasses = 5;
@@ -266,7 +266,23 @@ public async Task OnTestSessionFinishingAsync(ITestSessionContext testSessionCon
             return null;
         }
 
-        string fileName = string.Format(CultureInfo.InvariantCulture, DefaultSummaryFileNameFormat, _targetFrameworkMoniker.Value);
+        // Include the assembly name and process architecture in the default file name (matching the
+        // <asm>_<tfm>_<arch> shape used by the TRX/HTML/JUnit reports) so that multiple test assemblies
+        // that share the same target framework and TestResults directory (a common CI setup) don't all
+        // resolve to the same path and race to write it, which surfaced as
+        // "The process cannot access the file ... because it is being used by another process".
+        string assemblyName = _testApplicationModuleInfo.TryGetAssemblyName() ?? "unknown";
+        string architecture = RuntimeInformation.ProcessArchitecture.ToString().ToLowerInvariant();
+
+        // Sanitize the whole file name (matching TRX/HTML/JUnit) so that unexpected characters in any segment
+        // - including the target framework moniker or architecture, not just the assembly name - cannot produce
+        // an invalid file name.
+        string fileName = ReportFileNameSanitizer.ReplaceInvalidFileNameChars(string.Format(
+            CultureInfo.InvariantCulture,
+            DefaultSummaryFileNameFormat,
+            assemblyName,
+            _targetFrameworkMoniker.Value,
+            architecture));
         return Path.GetFullPath(Path.Combine(configuredTestResultsDirectory!, fileName));
     }
 
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Microsoft.Testing.Extensions.AzureDevOpsReport.csproj b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Microsoft.Testing.Extensions.AzureDevOpsReport.csproj
index eb863f0940..e9a3e00d87 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Microsoft.Testing.Extensions.AzureDevOpsReport.csproj
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Microsoft.Testing.Extensions.AzureDevOpsReport.csproj
@@ -12,6 +12,7 @@
     <Compile Include="$(RepoRoot)src\Platform\Microsoft.Testing.Platform\Helpers\RoslynString.cs" Link="Helpers\RoslynString.cs" />
     <Compile Include="$(RepoRoot)src\Platform\Microsoft.Testing.Platform\OutputDevice\TargetFrameworkParser.cs" Link="Helpers\TargetFrameworkParser.cs" />
     <Compile Include="$(RepoRoot)src\Platform\SharedExtensionHelpers\TargetFrameworkMonikerHelper.cs" Link="Helpers\TargetFrameworkMonikerHelper.cs" />
+    <Compile Include="$(RepoRoot)src\Platform\SharedExtensionHelpers\ReportFileNameSanitizer.cs" Link="Helpers\ReportFileNameSanitizer.cs" />
   </ItemGroup>
 
   <!-- NuGet properties -->
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/AzureDevOpsResources.resx b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/AzureDevOpsResources.resx
index 9e21aae3e9..838520836c 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/AzureDevOpsResources.resx
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/AzureDevOpsResources.resx
@@ -326,8 +326,8 @@
     <comment>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</comment>
   </data>
   <data name="SummaryOptionDescription" xml:space="preserve">
-    <value>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</value>
-    <comment>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</comment>
+    <value>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</value>
+    <comment>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</comment>
   </data>
   <data name="SummaryRequiresTfBuildWarning" xml:space="preserve">
     <value>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</value>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.cs.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.cs.xlf
index b10da00025..10784250b1 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.cs.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.cs.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Na konci testovacího běhu napište souhrn úlohy v Markdownu a nahrajte ho přes ##vso[task.uploadsummary]. Volitelný argument cesty k souboru přepíše výchozí umístění ({testResultsDir}/azdo-summary-{tfm}.md). Vyžaduje --report-azdo.</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Na konci testovacího běhu napište souhrn úlohy v Markdownu a nahrajte ho přes ##vso[task.uploadsummary]. Volitelný argument cesty k souboru přepíše výchozí umístění ({testResultsDir}/azdo-summary-{tfm}.md). Vyžaduje --report-azdo.</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.de.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.de.xlf
index 216a053da5..9e6f24a579 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.de.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.de.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Schreiben Sie am Ende des Testlaufs eine Markdownauftragszusammenfassung, und laden Sie sie über „##vso[task.uploadsummary]“ hoch. Ein optionales Dateipfadargument überschreibt den Standardspeicherort („{testResultsDir}/azdo-summary-{tfm}.md“). Erfordert „--report-azdo“.</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Schreiben Sie am Ende des Testlaufs eine Markdownauftragszusammenfassung, und laden Sie sie über „##vso[task.uploadsummary]“ hoch. Ein optionales Dateipfadargument überschreibt den Standardspeicherort („{testResultsDir}/azdo-summary-{tfm}.md“). Erfordert „--report-azdo“.</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.es.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.es.xlf
index def1b7213f..3e68a1b9e5 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.es.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.es.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Escriba un resumen del trabajo de Markdown al final de la serie de pruebas y cárguelo a través de "##vso[task.uploadsummary]". Un argumento de ruta de acceso de archivo opcional invalida la ubicación predeterminada ("{testResultsDir}/azdo-summary-{tfm}.md"). Requiere "--report-azdo".</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Escriba un resumen del trabajo de Markdown al final de la serie de pruebas y cárguelo a través de "##vso[task.uploadsummary]". Un argumento de ruta de acceso de archivo opcional invalida la ubicación predeterminada ("{testResultsDir}/azdo-summary-{tfm}.md"). Requiere "--report-azdo".</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.fr.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.fr.xlf
index 7d33561a32..b5fcb27101 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.fr.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.fr.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Rédigez un résumé de travail Markdown à la fin de l’exécution du test et chargez-le via « ##vso[task.uploadsummary] ». Un argument facultatif de chemin de fichier remplace l’emplacement par défaut (« {testResultsDir}/azdo-summary-{tfm}.md »). Nécessite « --report-azdo ».</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Rédigez un résumé de travail Markdown à la fin de l’exécution du test et chargez-le via « ##vso[task.uploadsummary] ». Un argument facultatif de chemin de fichier remplace l’emplacement par défaut (« {testResultsDir}/azdo-summary-{tfm}.md »). Nécessite « --report-azdo ».</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.it.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.it.xlf
index f5f83bfdef..280c7e5d32 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.it.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.it.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Scrive un riepilogo Markdown del processo alla fine dell'esecuzione dei test e lo carica tramite "##vso[task.uploadsummary]". Un argomento facoltativo per il percorso del file sostituisce il percorso predefinito ("{testResultsDir}/azdo-summary-{tfm}.md"). Richiede "--report-azdo".</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Scrive un riepilogo Markdown del processo alla fine dell'esecuzione dei test e lo carica tramite "##vso[task.uploadsummary]". Un argomento facoltativo per il percorso del file sostituisce il percorso predefinito ("{testResultsDir}/azdo-summary-{tfm}.md"). Richiede "--report-azdo".</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ja.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ja.xlf
index 4490ab4acf..118e4d7a1b 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ja.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ja.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">テスト実行の最後に Markdown のジョブ サマリーを作成し、'##vso[task.uploadsummary]' 経由でアップロードします。省略可能なファイル パス引数で、既定の場所 ('{testResultsDir}/azdo-summary-{tfm}.md') をオーバーライドできます。'--report-azdo' が必要です。</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">テスト実行の最後に Markdown のジョブ サマリーを作成し、'##vso[task.uploadsummary]' 経由でアップロードします。省略可能なファイル パス引数で、既定の場所 ('{testResultsDir}/azdo-summary-{tfm}.md') をオーバーライドできます。'--report-azdo' が必要です。</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ko.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ko.xlf
index 820b464aaa..1cf1c1d69f 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ko.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ko.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">테스트 실행이 끝날 때 Markdown 작업 요약을 작성하고 '##vso[task.uploadsummary]'를 통해 업로드합니다. 선택적 파일 경로 인수는 기본 위치('{testResultsDir}/azdo-summary-{tfm}.md')를 재정의합니다. '--report-azdo'가 필요합니다.</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">테스트 실행이 끝날 때 Markdown 작업 요약을 작성하고 '##vso[task.uploadsummary]'를 통해 업로드합니다. 선택적 파일 경로 인수는 기본 위치('{testResultsDir}/azdo-summary-{tfm}.md')를 재정의합니다. '--report-azdo'가 필요합니다.</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pl.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pl.xlf
index 8786286458..c940e1ed7c 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pl.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pl.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Zapisz podsumowanie zadania w formacie Markdown na końcu przebiegu testu i prześlij je za pomocą „##vso[task.uploadsummary]”. Opcjonalny argument ścieżki pliku zastępuje lokalizację domyślną („{testResultsDir}/azdo-summary-{tfm}.md”). Wymaga polecenia „--report-azdo”.</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Zapisz podsumowanie zadania w formacie Markdown na końcu przebiegu testu i prześlij je za pomocą „##vso[task.uploadsummary]”. Opcjonalny argument ścieżki pliku zastępuje lokalizację domyślną („{testResultsDir}/azdo-summary-{tfm}.md”). Wymaga polecenia „--report-azdo”.</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pt-BR.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pt-BR.xlf
index c54eee9ef4..a03cb77899 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pt-BR.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pt-BR.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Escreva um resumo do trabalho em Markdown no final da execução do teste e carregue-o pelo '##vso[task.uploadsummary]'. Um argumento opcional de caminho do arquivo substitui o local padrão ('{testResultsDir}/azdo-summary-{tfm}.md'). Requer '--report-azdo'.</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Escreva um resumo do trabalho em Markdown no final da execução do teste e carregue-o pelo '##vso[task.uploadsummary]'. Um argumento opcional de caminho do arquivo substitui o local padrão ('{testResultsDir}/azdo-summary-{tfm}.md'). Requer '--report-azdo'.</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ru.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ru.xlf
index 3d70ab5d7b..f3422d5ecb 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ru.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ru.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">По завершении тестового запуска составьте краткий отчет в формате Markdown и загрузите его с помощью "##vso[task.uploadsummary]". Необязательный аргумент, указывающий путь к файлу, переопределяет местоположение по умолчанию ("{testResultsDir}/azdo-summary-{tfm}.md"). Требуется "--report-azdo".</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">По завершении тестового запуска составьте краткий отчет в формате Markdown и загрузите его с помощью "##vso[task.uploadsummary]". Необязательный аргумент, указывающий путь к файлу, переопределяет местоположение по умолчанию ("{testResultsDir}/azdo-summary-{tfm}.md"). Требуется "--report-azdo".</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.tr.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.tr.xlf
index dd11936cab..f74117d5b9 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.tr.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.tr.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">Test çalıştırmasının sonunda bir Markdown iş özeti yazın ve '##vso[task.uploadsummary]' aracılığıyla karşıya yükleyin. İsteğe bağlı bir dosya yolu bağımsız değişkeni varsayılan konumu ('{testResultsDir}/azdo-summary-{tfm}.md') geçersiz kılar. '--report-azdo' gerektirir.</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">Test çalıştırmasının sonunda bir Markdown iş özeti yazın ve '##vso[task.uploadsummary]' aracılığıyla karşıya yükleyin. İsteğe bağlı bir dosya yolu bağımsız değişkeni varsayılan konumu ('{testResultsDir}/azdo-summary-{tfm}.md') geçersiz kılar. '--report-azdo' gerektirir.</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hans.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hans.xlf
index 7316a9d81f..b38f36eb0a 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hans.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hans.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">在测试运行结束时编写 Markdown 作业摘要，并通过 ‘##vso[task.uploadsummary]’ 上传它。可选文件路径参数会替代默认位置('{testResultsDir}/azdo-summary-{tfm}.md')。需要 '--report-azdo'。</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">在测试运行结束时编写 Markdown 作业摘要，并通过 ‘##vso[task.uploadsummary]’ 上传它。可选文件路径参数会替代默认位置('{testResultsDir}/azdo-summary-{tfm}.md')。需要 '--report-azdo'。</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hant.xlf b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hant.xlf
index 9683859d21..e753316130 100644
--- a/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hant.xlf
+++ b/src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hant.xlf
@@ -343,9 +343,9 @@
         <note>{0} is the maximum pattern count. {Locked="--report-azdo-stackframe-filter"}</note>
       </trans-unit>
       <trans-unit id="SummaryOptionDescription">
-        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.</source>
-        <target state="translated">在測試執行結束時撰寫 Markdown 工作摘要，並透過 '##vso[task.uploadsummary]' 上傳。選用檔案路徑引數會覆寫預設位置 ('{testResultsDir}/azdo-summary-{tfm}.md')。需要 '--report-azdo'。</target>
-        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{tfm}.md"}{Locked="--report-azdo"}</note>
+        <source>Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.</source>
+        <target state="needs-review-translation">在測試執行結束時撰寫 Markdown 工作摘要，並透過 '##vso[task.uploadsummary]' 上傳。選用檔案路徑引數會覆寫預設位置 ('{testResultsDir}/azdo-summary-{tfm}.md')。需要 '--report-azdo'。</target>
+        <note>{Locked="Markdown"}{Locked="##vso[task.uploadsummary]"}{Locked="{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md"}{Locked="--report-azdo"}</note>
       </trans-unit>
       <trans-unit id="SummaryRequiresTfBuildWarning">
         <source>Azure DevOps job summary was requested, but TF_BUILD is not set to 'true'; skipping summary emission.</source>
diff --git a/test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/HelpInfoAllExtensionsTests.cs b/test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/HelpInfoAllExtensionsTests.cs
index 4a92230154..d42c380ca6 100644
--- a/test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/HelpInfoAllExtensionsTests.cs
+++ b/test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/HelpInfoAllExtensionsTests.cs
@@ -146,7 +146,7 @@ Minimum number of historical samples required before a test's history is used to
     --report-azdo-stackframe-filter
         Additional regex patterns (matched against the fully-qualified type prefix of each stack frame) that should be skipped when looking for the user's call site to annotate. Repeatable; up to 16 patterns. Compiled with a 500ms match timeout. Additive to the extension's built-in MSTest assertion-implementation prefixes.
     --report-azdo-summary
-        Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.
+        Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.
     --report-azdo-upload-artifact-exclude
         Exclude files from Azure DevOps artifact upload using glob patterns relative to the test results directory.
     --report-azdo-upload-artifact-include
@@ -435,7 +435,7 @@ This option takes precedence over the deprecated --no-progress flag.
       --report-azdo-summary
         Arity: 0..1
         Hidden: False
-        Description: Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{tfm}.md'). Requires '--report-azdo'.
+        Description: Write a Markdown job summary at the end of the test run and upload it via '##vso[task.uploadsummary]'. An optional file path argument overrides the default location ('{testResultsDir}/azdo-summary-{assembly}-{tfm}-{arch}.md'). Requires '--report-azdo'.
       --report-azdo-upload-artifact-exclude
         Arity: 0..N
         Hidden: False
diff --git a/test/UnitTests/Microsoft.Testing.Extensions.UnitTests/AzureDevOpsSummaryReporterTests.cs b/test/UnitTests/Microsoft.Testing.Extensions.UnitTests/AzureDevOpsSummaryReporterTests.cs
index c6542787bd..cf888f7772 100644
--- a/test/UnitTests/Microsoft.Testing.Extensions.UnitTests/AzureDevOpsSummaryReporterTests.cs
+++ b/test/UnitTests/Microsoft.Testing.Extensions.UnitTests/AzureDevOpsSummaryReporterTests.cs
@@ -161,6 +161,9 @@ public async Task SessionFinishing_WritesSummaryFileAndEmitsUploadSummaryCommand
         Assert.HasCount(1, lines);
         Assert.StartsWith("##vso[task.uploadsummary]", lines[0]);
         Assert.Contains("azdo-summary-", lines[0]);
+        // The assembly name must be part of the default file name so concurrent test assemblies
+        // sharing the same TFM and TestResults directory don't race to write the same file.
+        Assert.Contains("MyAssembly", lines[0]);
         Assert.EndsWith(".md", lines[0]);
     }