Any specific reason you're looking for this info in registry?  Do you need to get this via programmatic means?? Otherwise, I assume you would have simply looked at User Tool ==> Help ==> About dialog Or aruser.exe version information via Windows Explorer ==> Select aruser.exe, right click on it ==> Properties context menu ==> Version tab. If you need to get this info programmaticaly without these manual actions, then may be you can use Win32 APIs to look at resource information on aruser.exe.

Appajee