What is the windows XP equivalent of 'User Choice' in the registry?

Question

What would the windows xp equivalent be of deleting the key 'User Choice' in windows7/vista registry (to restore default program to be used to open a partcular file extension).

Answer 1

Never mind — I figured it out. In case anyone else needs this answer here is what works:

In XP I deleted one key up from where 'user choice' would be in Vista/Win 7.

So to restore the default program to open this extension, I deleted:

HKEY_CURENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Fileexts.myExt

(where .myExt is the extension you're trying to fix)