Vista doesn't Support WinHelp [FIX]
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With the release of Windows Vista, Microsoft has decided that the good old WinHelp format no longer meets its standards. When your users try to open a .hlp file on Windows Vista, they'll get an error message saying your application is using an outdated format for its help.
Microsoft does make a WinHelp viewer for Vista available for download.
hXXp://go.microsoft.com/fwlink/?LinkID=82148
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