Setting WINVER

OK,a dumb and simple question - I'm recompiling my ap in VS2008 (from 6.0).  Every file gives the warning:

 WINVER not defined. Defaulting to 0x0600 (Windows Vista)

What is my best strategy?  Where to set WINVER, what to set it to.....

Thanks!
tullheadAsked:
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jkrCommented:
If that still is related to your ast Q, set it to 0x501, which will keep all features out that are specific for versions later than XP. As a rule of thumb: Set that to resemble the oldest Windows version you want to support. Wehre to set? Either before any '#include <windows.h>' directive or better project wide in your project settings  (ALT+F7) under "Configuration Properties|C++|Preprocessor|Preprocessor Definitions" As "WINVER=0x501".
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