In your ~/.wine/dosdevices/ directory, do you have a symbolic link named z: that points to /? If not, that may be the problem. I think Wine needs to have a DOS mapping of the argument to be able to find it in the DOS/Windows world. Drive z: covers all bases, so it's created by default. If that's not it, I don't have a clue either. But there's no need to apologize for being new.
