http://www.soldat.pl/man/register-en.html
Here's the link.

As for your error message, I can't really tell you much. It seems like Soldat is trying to open your browser/the URL but simply fails for whatever reason (Windows registry entry missing perhaps).

Ah so it's trying to open the browser...well I do use Firefox instead of Internet Explore. Mayber there is a conflict there...?

Maybe, but you're the first one to complain and there are quite a few people using Firefox.

mmh if you removed internet explorer, dont forget to set Firefox as standard browser then.

Arch Enemy - Ravenous .. Great song ;)

I've never heard of this problem before .. hmm..

but since you got the link, it's all good :D
if people like you like the game enough to actually join and SEARCH the forums looking for a way to register, then michal's obviously doing something right.