CRegKey Create() not working

Hi. I'm having issues with the following code. It's used to fix weird colors with certain games on Vista / 7. It seems to work for almost everyone. But, I found an exception today.

Code:

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x = rk.Create( HKEY_LOCAL_MACHINE, "Software\\Microsoft\\DirectDraw\\Compatibility\\Duke Nukem 3D");

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I have verified that UAC is disabled. The program and user have full privileges to those keys. Create() returns ERROR_SUCCESS. But, the key never gets created. Interestingly, there is another spot that the key has to be created in on 64-bit systems:

Code:

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x = rk.Create( HKEY_LOCAL_MACHINE, "Software\\Wow6432Node\\Microsoft\\DirectDraw\\Compatibility\\Duke Nukem 3D");

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This works fine. Why would the second one work, but not the first?

Also, if I do these from a reg file, they both work...

Ok. I do see one difference in the keys. The Wow6432Node and down don't have special permissions checked. The first one does have it checked. But, when I make the permissions the same, still can't create the first key. Do I need to specify another type of security flag to create the first one?

Hmmm, it appears the first one actually modifies the location of the 2nd one? Is this by design for 64-bit systems? I guess it makes me wonder why there would be 2 Directdraw Compatibility folders if the program only modifies the second one?

Please, read about 32-bit and 64-bit Application Data in the Registry

In case you run 32-bit application in 64-bit Windows, the 32-bit registry hive, which is WoW6432Node, appears to be in use.

Ok, makes sense. Thanks.