What would be the Windows XP equivalent of deleting the key
User Choice in the Windows 7/Vista registry (to restore the default program to be used to open a particular file extension)?
migrated from stackoverflow.com Dec 14 '11 at 13:57
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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
So to restore the default program to open this extension, I deleted
(where .myExt is the extension you're trying to fix)