<desktop6:Extension
Category = 'A string that can have one of the following values: "windows.mutablePackageDirectories" or "windows.customInstall".'
Executable = 'An optional string with a value between 1 and 256 characters in length that must end with ".exe" and cannot contain these characters: <, >, :, ", |, ?, or *. It specifies the default executable for the extension. If not specified, the executable defined for the app is used. If specified, the EntryPoint property is also used. If that EntryPoint property isnt specified, the EntryPoint defined for the app is used.'
EntryPoint = 'An optional string with a value between 1 and 256 characters in length, representing the task handling the extension. This is normally the fully namespace-qualified name of a Windows Runtime type. If EntryPoint is not specified, the EntryPoint defined for the app is used instead.'
RuntimeType = 'An optional string with a value between 1 and 255 characters in length that cannot start or end with a period or contain these characters: <, >, :, ", /, \, |, ?, or *.'
StartPage = 'An optional string with a value between 1 and 256 characters in length that cannot contain these characters: <, >, :, ", |, ?, or *.'
uap10:TrustLevel = 'An optional string that can have one of the following values: "appContainer" or "mediumIL".'
uap10:RuntimeBehavior = 'An optional string that can have one of the following values: "windowsApp", "packagedClassicApp", or "win32App".'
uap10:HostId = 'An alphanumeric string with a value between 1 and 255 characters in length. Must begin with a letter.'
uap10:Parameters = 'An optional string with a value between 1 and 32767 characters in length with a non-whitespace character at its beginning and end.' >
<!-- Child elements -->
( desktop6:MutablePackageDirectories
| desktop6:CustomInstall )?
</desktop6:Extension>