It would be nice if you didn't refer to it as an MC bug until you know what causes it.
Where did I said it was a MC bug?
Anyway, I think it is. MC tries to inform about my system, and it is not able to. If it is caused by my machine, MC could inform about that: "Polonio, your system is out of date, update CD-ROM parity, and free some hard disk space to allow boolean bits recollection... By the way, Polonio, you own a PIII 1.3 GB, and your music taste is terrible....". But MC does not inform that way. It says: "An invalid argument was encountered". Did I ask MC to look for an invalid argument? I asked for my system info!!!
I dont know if you see my point...
Your other "bug" turned out to be a problem with file associations left by uninstalling another program.
It seems MC is just as your own child. I didn't want to offend you.