Returns TRUE if the operating system is at least reqMinOS and service pack at least reqMinServicePack. Example 1: IsOSVersionAtLeast (WIN_VISTA, 1) called under Windows 2008, returns TRUE. Example 2: IsOSVersionAtLeast (WIN_XP, 3) called under Windows XP SP1, returns FALSE. Example 3: IsOSVersionAtLeast (WIN_XP, 3) called under Windows Vista SP1, returns TRUE.
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