[Wine] How to import registry of Windows XP backup?

[Wuzzy]

I have a game for Windows where the entire game status is saved in the registry. The game works good under Wine. After a reinstallation the registry got wiped out and therefore my game status.
(This game is not important, it could be any program which writes something very important into the registry which I need to restore)

But I have an entire backup of my old Windows XP installation. Because Win XP stores registry files under C:\WINDOWS\System32\config\ this backup also contains my registry and also the game status I need.

So the dumb thing is, I have the registry, know which keys I need to restore my game status but I don't know how to get the fucking keys out of the registry? These files are not the .reg files regedit can use for simple import. These files ARE the registry, but I don't know how to read it.

So I want to know how I can get these keys out of the (non-exported) registry on my backup and get them into the Wine registry?

Thanks in advance. :-)