PCall is not supported anymore, so this code will not work:

PCall( ptrFunction, @strWinOsVersionInfo )

You need to know the return type of the called function and change it do PCallNative:

PCallNative<int>( ptrFunction, @strWinOsVersionInfo )

If you need source code compatibility to VO, use #ifdef:

#ifdef __XSHARP__
PCallNative<int>( ptrFunction, @strWinOsVersionInfo )
#else 
PCall( ptrFunction, @strWinOsVersionInfo )
#endif