restore reg keys : HELP!!!

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I'd like to backup and re-use some keys that belongs to some apps, in order to re-import them after a new and fresh install of the app to have all the prefs already prepared.
When I save reg keys on my memory card, it saves (without extension) a WinCE Registration File (*.reg).
The problem is when I try to re-import these keys into the registry because... I CAN'T!
The device doesn't recognize the files and I don't know how to import 'em

HEEEEEEEEEEEEEEEEELP please

found: done with resco