>Did someone answer this already?
>
>What does OS(1) return under Vista?
>
>John Burton

"Windows 6.00"

Maybe you can find this useful:

Val(Os(3)) * 1000000 + Val(Os(4)) * 10000 + Val(Os(8)) * 100 + Val(Os(9))

#Define CON_OS_WIN95		4000000
#Define CON_OS_WIN98		4100000
#define CON_OS_WIN2K		5000000
#define CON_OS_WIN2KSP1		5000100
#define CON_OS_WIN2KSP2		5000200
#define CON_OS_WIN2KSP3		5000300
#define CON_OS_WIN2KSP4		5000400
#define CON_OS_WINXP		5010000
#define CON_OS_WINXPSP1		5010100
#define CON_OS_WINXPSP2		5010200
#define CON_OS_WS03		5020000
#define CON_OS_WS03SP1		5020100
#define CON_OS_LONGHORN 	6000000
#define CON_OS_WINVISTA         6000000