happy to see I have some answers after all this time. Since my first post, I still didn't find a rom cleaner as good as romcenter on linux, but I don't know all of them.
Now, I'm using Wine 0.9.30 and I changed the directory in the preferences.
So now I could load dat files, but only local dat, not from the internet. If I try to load one from the internet I obtain this:
and when I exit from the appplication, I have this window again:
and if I don't have it I have to kill all the wine process.
Someone tried the 3 beta version with wine?