I don't use registry, only thing i do is write a area.dat file to same folder as application itself to store name and highscores.

Here is download for you to test:
http://uploading.com/files/9FV66SU9/Area.zip.html
Edit: Link renewed 15.12.2008

Looks like this:
http://i36.tinypic.com/mb5zi9.jpg