How does the Compatibility Mode in Windows work internally?

comp mode

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good question...I've been curious about that myself...+1 – studiohack Apr 22 '10 at 17:03
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I think a lot of different things happen. A straightforward example is that a program might check your windows version, but get confused by the return value of a new operating system. So using compatibility mode would tell windows to report a wrong version. Raymond Chen mentions some more things: http://blogs.msdn.com/oldnewthing/archive/2003/12/23/45481.aspx#45590

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