Swede,
You mean you have the 64-bit version? But I thought that only runs on an Itanium processor!
http://www.microsoft.com/windowsxp/64bit/overview.asp
Or did this accidently sneak into the helpfile of the regular 32-bit version?
This is not really helpful I am afraid. Anyway I uploaded a new revision which also passes the working directory to regedit. I keep hoping.
BTW what happens when you type in the command line: regedit.exe /s x:\apppath\a.reg
where x is of course your drivename and apppath.... well, you get the point.