build: convert all solutions from .sln to .slnx

- migrate 15 tracked solutions; update .slnf paths, workflows, build
  files, repo-root markers, ios/android runners, .vscode, docs
- Stride.slnx: drop vestigial x86/x64/Mixed Platforms (solution is
  all-managed) and build with Platform=Any CPU; GameStudio listed first
  so it stays the default startup project
- Stride.VisualStudio.slnx: Package project first (default startup)
- samples: drop dead AppStore/Testing/Windows configs (no per-platform
  exec projects remain, only .Game + .Windows)

Author: xen2

.gitattributes

@@ -12,6 +12,8 @@
 *.bat     text eol=crlf
 *.csproj  text eol=crlf
 *.sln     text eol=crlf
+*.slnf    text eol=crlf
+*.slnx    text eol=crlf
 
 # Declare files that will always have LF line endings on checkout.
 *.sh      text eol=lf

.github/workflows/build-assembly-processor.yml

@@ -38,7 +38,7 @@ jobs:
           exclude: samples
       - name: Build
         run: |
-          dotnet build build\Stride.AssemblyProcessor.sln `
+          dotnet build build\Stride.AssemblyProcessor.slnx `
             -restore -nr:false `
             -v:m -p:WarningLevel=0 `
             -p:Configuration=${{ github.event.inputs.build-type || inputs.build-type || 'Debug' }} `

.github/workflows/build-launcher.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
     paths:
       - '.github/workflows/build-launcher.yml'
-      - 'build/Stride.Launcher.sln'
+      - 'build/Stride.Launcher.slnx'
       - 'sources/core/**'
       - 'sources/launcher/**'
       - 'sources/presentation/**'
@@ -58,7 +58,7 @@ jobs:
           exclude: samples
       - name: Build
         run: |
-          dotnet build build\Stride.Launcher.sln `
+          dotnet build build\Stride.Launcher.slnx `
             -v:m -p:WarningLevel=0 `
             -p:Configuration=${{ github.event.inputs.build-type || inputs.build-type || 'Debug' }} `
             -p:StridePlatforms=Windows `

.github/workflows/build-vs-package.yml

@@ -38,7 +38,7 @@ jobs:
           exclude: samples
       - name: Build
         run: |
-          dotnet build build\Stride.VisualStudio.sln `
+          dotnet build build\Stride.VisualStudio.slnx `
             -nr:false `
             -v:m -p:WarningLevel=0 `
             -p:Configuration=${{ github.event.inputs.build-type || inputs.build-type || 'Debug' }} `

.github/workflows/build-windows-full-msbuild.yml

@@ -1,6 +1,6 @@
 name: Build Windows (Full, VS MSBuild)
 
-# Desktop-MSBuild fidelity check: builds Stride.sln the way Visual Studio does —
+# Desktop-MSBuild fidelity check: builds Stride.slnx the way Visual Studio does —
 # .NET Framework MSBuild engine, separate restore (no dotnet-build sugar), VS dev
 # environment so VCINSTALLDIR selects the MSVC native build mode (the
 # WindowsDesktop.vcxproj link path VS users get with the C++ workload). Everything
@@ -48,19 +48,21 @@ jobs:
         # VS restores via its NuGet integration before building; bare /t:Restore is the
         # CLI equivalent. Same properties as Build so the TFM graph matches.
         run: |
-          msbuild build\Stride.sln `
+          msbuild build\Stride.slnx `
             /t:Restore `
             /m /nr:false /v:m /p:WarningLevel=0 `
             /p:Configuration=${{ github.event.inputs.build-type || 'Debug' }} `
+            /p:Platform="Any CPU" `
             /p:StridePlatforms=Windows `
             /p:StrideGraphicsApiDependentBuildAll=true `
             /p:StrideSkipUnitTests=true `
             /p:StrideSkipAutoPack=true
       - name: Build
         run: |
-          msbuild build\Stride.sln `
+          msbuild build\Stride.slnx `
             /m /nr:false /v:m /p:WarningLevel=0 `
             /p:Configuration=${{ github.event.inputs.build-type || 'Debug' }} `
+            /p:Platform="Any CPU" `
             /p:StridePlatforms=Windows `
             /p:StrideGraphicsApiDependentBuildAll=true `
             /p:StrideSkipUnitTests=true `

.github/workflows/build-windows-full.yml

@@ -35,7 +35,7 @@ jobs:
           ref: ${{ github.ref }}
       - name: Build
         run: |
-          dotnet build build\Stride.sln `
+          dotnet build build\Stride.slnx `
             -nr:false `
             -v:m -p:WarningLevel=0 `
             -p:Configuration=${{ github.event.inputs.build-type || inputs.build-type || 'Debug' }} `

.github/workflows/changes.yml

@@ -121,4 +121,4 @@ jobs:
             full:
               - 'sources/**'
               - 'deps/**'
-              - 'build/Stride.sln'
+              - 'build/Stride.slnx'

.github/workflows/check-parallel-build.yml

@@ -5,7 +5,7 @@ on:
     paths:
       - '.github/workflows/check-parallel-build.yml'
       - 'build/tools/ParallelBuildAuditor/**'
-      - 'build/Stride.sln'
+      - 'build/Stride.slnx'
       - 'sources/**/*.csproj'
       - 'sources/**/*.targets'
       - 'sources/**/*.props'
@@ -35,12 +35,12 @@ jobs:
       - name: Build ParallelBuildAuditor
         run: dotnet build build\tools\ParallelBuildAuditor\ParallelBuildAuditor.csproj -c Release -nologo -v:m
 
-      - name: Build Stride.sln (capturing binlog)
+      - name: Build Stride.slnx (capturing binlog)
         # Continue on build error: even partial binlog data is enough for leak detection
-        # (and Stride.sln contains native vcxproj projects that may fail under dotnet build).
+        # (and Stride.slnx contains native vcxproj projects that may fail under dotnet build).
         continue-on-error: true
         run: |
-          dotnet build build\Stride.sln `
+          dotnet build build\Stride.slnx `
             -bl:parallel-audit.binlog `
             -nr:false `
             -v:m -p:WarningLevel=0 `

.vscode/settings.json

@@ -1,5 +1,5 @@
 {
-    "dotnet.defaultSolution": "build/Stride.sln",
+    "dotnet.defaultSolution": "build/Stride.slnx",
     "files.watcherExclude": {
         "**/obj/**": true,
         "**/bin/**": true

README.md

@@ -73,7 +73,7 @@ Our [Roadmap](https://doc.stride3d.net/latest/en/contributors/roadmap.html) comm
 ### Build Stride
 
 1. `git clone https://github.com/stride3d/stride.git`
-2. Open `build\Stride.sln` in Visual Studio 2026.
+2. Open `build\Stride.slnx` in Visual Studio 2026.
 3. Build the `Stride.GameStudio` project (default startup, in the `60-Editor` folder) or run it directly from the toolbar.
 
 ### Contribution Guidelines