W1005 Unit '%s' is specific to a platform (Object Pascal)
The whole unit is tagged (using the platform hint directive) as one that contains material that may not be available on all platforms. If you are writing cross-platform applications, it may cause a problem. For example, a unit that uses objects defined in OleAuto might be tagged using the PLATFORM directive
The $WARN UNIT_PLATFORM ON/OFF compiler directive turns on or off all warnings about the platform directive in units where the platform directive is specified.