From 083ccb49e9439348d2b1c9b042a266d79d572851 Mon Sep 17 00:00:00 2001
From: Dinah Xiaomgao G <116714259+DinahK-2SO@users.noreply.github.com>
Date: Fri, 22 May 2026 18:34:34 +0800
Subject: [PATCH 1/2] Fix VSSDK1300 in CreateVsix: shorten Dev17 VSIX
 intermediate paths

Long project names plus deep VSSDK extraction paths exceed MAX_PATH on CI.

Alias Cpp17/Cs17 saves ~27 chars per path; restores headroom for new assets.
---
 dev/Templates/VSIX/Directory.Build.props | 27 +++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/dev/Templates/VSIX/Directory.Build.props b/dev/Templates/VSIX/Directory.Build.props
index e3a4539f9b..e2a30c0c46 100644
--- a/dev/Templates/VSIX/Directory.Build.props
+++ b/dev/Templates/VSIX/Directory.Build.props
@@ -24,7 +24,32 @@
         <SolutionDir Condition="!Exists('$(SolutionDir)')">$(MSBuildThisFileDirectory)</SolutionDir>
         <BuildOutput Condition="'$(BuildOutput)' == ''">$(SolutionDir)BuildOutput\</BuildOutput>
         <BuildOutputRoot>$(BuildOutput)obj\$(Platform)$(Configuration)\$(Deployment)\</BuildOutputRoot>
-        <BaseIntermediateOutputPath>$(BuildOutputRoot)$(MSBuildProjectName)\</BaseIntermediateOutputPath>
+    </PropertyGroup>
+
+    <!--
+        Use a short alias for the project's intermediate / output folder segment
+        instead of $(MSBuildProjectName). The VSSDK GenerateTemplatesManifest task
+        extracts every vstemplate .zip to
+            $(IntermediateOutputPath)$(TargetFramework)\{Project|Item}Templates\<Lang>\<Locale>\<TemplateName>\...
+        which, combined with the deeply nested template asset paths (e.g.
+        Assets\Square44x44Logo.targetsize-48_altform-lightunplated.png) easily
+        exceeds the Windows MAX_PATH (260) limit on CI agents (repo root
+        C:\__w\1\s\WindowsAppSDK\). When that happens the task aborts mid-stream
+        with "VSSDK1300: An error occurred while attempting to extract the
+        vstemplate zip files." and only reports the first file that overflowed,
+        even though many additional files are silently dropped.
+
+        Replacing the ~32-char project name with a 4-5 char alias saves ~27
+        characters per path, giving generous headroom for future template assets.
+        Only the two long-named Dev17 VSIX projects need shortening; everything
+        else continues to use $(MSBuildProjectName) for diagnosability.
+    -->
+    <PropertyGroup>
+        <_VsixProjectFolderAlias>$(MSBuildProjectName)</_VsixProjectFolderAlias>
+        <_VsixProjectFolderAlias Condition="'$(MSBuildProjectName)' == 'WindowsAppSDK.Cpp.Extension.Dev17'">Cpp17</_VsixProjectFolderAlias>
+        <_VsixProjectFolderAlias Condition="'$(MSBuildProjectName)' == 'WindowsAppSDK.Cs.Extension.Dev17'">Cs17</_VsixProjectFolderAlias>
+
+        <BaseIntermediateOutputPath>$(BuildOutputRoot)$(_VsixProjectFolderAlias)\</BaseIntermediateOutputPath>
         <IntermediateOutputPath>$(BaseIntermediateOutputPath)</IntermediateOutputPath>
         <OutputPath>$(IntermediateOutputPath)</OutputPath>
         <OutDir>$(OutputPath)</OutDir>

From fc7e8ec2b48c2f864496cc11b9c5683adf8bfff2 Mon Sep 17 00:00:00 2001
From: Dinah Xiaomgao G <116714259+DinahK-2SO@users.noreply.github.com>
Date: Fri, 22 May 2026 19:29:25 +0800
Subject: [PATCH 2/2] simplify comment

---
 dev/Templates/VSIX/Directory.Build.props | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/dev/Templates/VSIX/Directory.Build.props b/dev/Templates/VSIX/Directory.Build.props
index e2a30c0c46..7979540dcb 100644
--- a/dev/Templates/VSIX/Directory.Build.props
+++ b/dev/Templates/VSIX/Directory.Build.props
@@ -27,22 +27,13 @@
     </PropertyGroup>
 
     <!--
-        Use a short alias for the project's intermediate / output folder segment
-        instead of $(MSBuildProjectName). The VSSDK GenerateTemplatesManifest task
-        extracts every vstemplate .zip to
-            $(IntermediateOutputPath)$(TargetFramework)\{Project|Item}Templates\<Lang>\<Locale>\<TemplateName>\...
-        which, combined with the deeply nested template asset paths (e.g.
-        Assets\Square44x44Logo.targetsize-48_altform-lightunplated.png) easily
-        exceeds the Windows MAX_PATH (260) limit on CI agents (repo root
-        C:\__w\1\s\WindowsAppSDK\). When that happens the task aborts mid-stream
-        with "VSSDK1300: An error occurred while attempting to extract the
-        vstemplate zip files." and only reports the first file that overflowed,
-        even though many additional files are silently dropped.
-
-        Replacing the ~32-char project name with a 4-5 char alias saves ~27
-        characters per path, giving generous headroom for future template assets.
-        Only the two long-named Dev17 VSIX projects need shortening; everything
-        else continues to use $(MSBuildProjectName) for diagnosability.
+        Shorten the project's output folder segment to stay under Windows
+        MAX_PATH (260) on CI. VSSDK's GenerateTemplatesManifest extracts every
+        vstemplate .zip under $(IntermediateOutputPath)$(TargetFramework)\...,
+        which combined with the ~32-char Dev17 project names and deep template
+        asset paths overflows on CI (repo root C:\__w\1\s\WindowsAppSDK\) and
+        aborts with VSSDK1300. Cpp17/Cs17 save ~27 chars per path; other
+        projects keep $(MSBuildProjectName) for diagnosability.
     -->
     <PropertyGroup>
         <_VsixProjectFolderAlias>$(MSBuildProjectName)</_VsixProjectFolderAlias>