[Breaking Change] Unpackaged Win32 app using Fixed Version v120+ on Win10 need ACL

[victorhuangwq]

Due to security feature introduced in Edge/WebView2 Runtime v120 to run Renderer process inside App Container, the Fixed Version runtime in its loose binaries form needs proper ACL in order to function.

If you are picking up Fixed Version v120 and above for an unpackaged Win32 app and you are targeting Windows 10 devices, you need to take step 6 in Details about the Fixed Version runtime distribution mode otherwise WebView2 will crash on launch. This does not impact Windows 11 and does not impact evergreen or packaged Fixed Version app. This also does not impact app using Fixed Version v119 or earlier.