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Chapter Thirteen. Backward Compatibility > Why not just block the applications ...
Why not just block the applications that rely on undocumented behavior?
BECAUSE EVERY APPLICATION that gets blocked is another reason for people not to upgrade to the next version of Windows. If you run the Registry Editor and look at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Compatibility, you’ll see a list of programs that would have stopped working when you upgraded from Windows 3.0 to Windows 3.1. Actually, this list is only partial. Many times, the compatibility fix is made inside the core component for all programs rather than targeting a specific program, as this list does.
Note
On Windows XP, the application compatibility database is stored in your C:\WINDOWS\AppPatch directory, in a binary format to permit rapid scanning. To inspect its contents, you can run the Compatibility Administrator tool, which is part of the Application Compatibility Toolkit.
