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1.Run Registry Editor
2.open
HKEY_LOCAL_MACHINE\SOFTWARE\Red Storm Entertainment\Tom Clancy's Rainbow Six\MouseRadiansPerPixel
3.Change MouseRadiansPerPixel value
you can change mouse sensitivity//
Cool. "+" rating to you for extra information.
On my computer (Vista x64) the value was stored in \HKEY_CURRENT_USER\Software\Classes\VirtualStore\MACHINE\SOFTWARE\Wow6432Node\Red Storm Entertainment\Tom Clancy's Rainbow Six
A huge big thanks to you both, sajin and wavew. Is a life saver.