The registry for the most part isn't OS specific. Most of the registry keys found in 98 are also found in XP, 2000, ME etc. The exception would be the HKEY_LOCAL_MACHINEWindowsNT key, which I believe is only found in the NT based OS models. NT, XP, and 2K. Other than that the registry is pretty standard due to the large amount of keys that are required by different software. As for your question, yes, that key does exist in XP.