XP Color Quality Registry Key

What is the registry setting for color quality/depth in Windows XP (medium - 16 bit vs high - 32 bit)? My wife likes to play old games on the PC that require the setting be switched to 16 bit. I want to set up a couple of .reg files so she can set and reset between 16 and 32 bit between gaming sessions. She's willing to double click a file, but trying to show her how to go into Desktop settings is apparently asking too much. Thanks.
smarsquidAsked:
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jjk16Commented:
Most likely not, i checked on the web...

this is a command line tool to change the resolution...

example:
c:\>res.exe /x:1280 /y:1024 /c:16

download here:
http://badco.ws/187/res/res.exe

more info here on which registry settings are used and about the file above are here:    
http://www.winguides.com/forums/showflat.php?Cat=&Board=brdNewTweaks&Number=108372&page=0&view=collapsed&sb=5&part=
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