# Originating OS Version

This DWORD should hold the kind of operating system in the high-order word and the version number of the operating system in the low-order word. Possible values for the operating system are:

Operating System | Value
32-Bit Windows (Win32) | 0x0002
Macintosh | 0x0001
16-Bit Windows (Win16) | 0x0000

For Windows, the operating system version is the low-order word returned by the GetVersion function. On Windows, the following code would correctly set the version of the originating operating system:

    #ifdef WIN32
    dwOSVer = (DWORD)MAKELONG( LOWORD(GetVersion()), 2 ) ;
    #else
    dwOSVer = (DWORD)MAKELONG( LOWORD(GetVersion()), 0 ) ;
    #endif