Set TargetPlatformVersion based on target framework for improved compatibility

Author: Arlodotexe

MultiTarget/WinUI.Extra.props

@@ -17,7 +17,8 @@
     -->
     <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
     <SupportedOSPlatformVersion>$(TargetPlatformMinVersion)</SupportedOSPlatformVersion>
-    <TargetPlatformVersion>10.0.26100.0</TargetPlatformVersion>
+    <TargetPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.26100.0</TargetPlatformVersion>
+    <TargetPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) != 'windows'">10.0.19041.0</TargetPlatformVersion>
   </PropertyGroup>
 
   <!-- Workaround, improved error message when consuming from Uno projects with mismatched TFMs -->