[Arlodotexe]

Background

PR #803 intended to fully upgrade us to the windows-2025 runners and has been reviewed by a frequent contributor, closed and merged into main.

Problem

This was surfaced by @Avid29 in the #community-toolkit - Targeting .NET 10 thread on Discord after bringing in the #803 work to unblock #791.

The broken CI problem only appears on #791 and not on main because surfacing it requires bumping our minimum msbuild version to at least 18.0 and it requires bumping the runner (v17.0 is not included on windows-2025).

Some small but obvious edits were missed and required a follow up PR to fix.

Solution

Corrections have been made. Small PR.

Must resolve disc size issues first

[Arlodotexe]

Found the background info and original source of the bug for the disk space issue here.

The mistake was made on Oct 2nd 2025 under https://github.com/CommunityToolkit/Windows/pull/737/files.

Per the comments from @michael-hawker in the PR/Issue on this, we intended to keep the "large" runner wherever it was used, but the change here doesn't reflect that.

It looks like the bad change has persisted unnoticed since then. The fix here is now certain and should be simple, I'll push that up in a moment.

[Arlodotexe]

Closing and re-opening to hopefully rekick CI

[Arlodotexe]

Status update on where we are now:

Wasdk is passing now, but UWP is still having this same issue:

PS V:\Labs-Windows> gh run view 26116949465 --log-failed --job 76808805796 | select-string -pattern "error.+?:" | select -last 2

build (2, uwp)    UNKNOWN STEP    2026-05-19T19:08:37.9362118Z          EXEC : error : Could not read the Windows SDK's 
Platform.xml at C:\Program Files (x86)\Windows Kits\10\Platforms\UAP\10.0.17763.0\Platform.xml [C:\a\Labs-Windows\Labs-
Windows\components\DependencyPropertyGenerator\src\CommunityToolkit.WinUI.DependencyPropertyGenerator.csproj::TargetFra
mework=net8.0-windows10.0.17763.0]
build (2, uwp)    UNKNOWN STEP    2026-05-19T19:08:37.9364277Z          
C:\Users\runneradmin\.nuget\packages\microsoft.windows.cswinrt\2.2.0\build\Microsoft.Windows.CsWinRT.targets(293,5): 
error MSB3073: The command ""C:\Users\runneradmin\.nuget\packages\microsoft.windows.cswinrt\2.2.0\cswinrt.exe" @"C:\a\L
abs-Windows\Labs-Windows\components\DependencyPropertyGenerator\src\obj\x64\Release\net8.0-windows10.0.17763.0\Generate
d Files\CsWinRT\cswinrt.rsp"" exited with code 1. [C:\a\Labs-Windows\Labs-Windows\components\DependencyPropertyGenerato
r\src\CommunityToolkit.WinUI.DependencyPropertyGenerator.csproj::TargetFramework=net8.0-windows10.0.17763.0]

That's a discrepancy from the behavior I was getting on my local machine. I was able to build with at minimum the 19041 and 26100 SDKs installed, I haven't been able to reproduce this exact error locally on UWP yet.