In case you both don't know where the FAQ is: http://wiki.winehq.org/FAQ#head-903eaf89ed775396f776438ec126ea9336828473 Those .reg files are not the real .reg files. If you brake them, the entire registry can get corrupt. Or in the best case your changes will simply be overwritten by wineserver. And if you really must know what those numbers are - read wineserver's source code.