> Wow fast reply!
>
> Yeah i see but what i don't understand is why ClrMamePro does not simply rename
> *.smc for example to *.bin instead of putting every game with another extension
> in the backup folder! ClrMamePro did the same thing for some gameboy games that
> were .gb instead of .sgb...
>

It doesn't put them in the backupfolder because of the wrong extension.
Fixname renames them fine.
The problem is that your files are marked as unneded because they probably still have a header and so the crc32 doesn't match. Goodtools don't care about headers and skip them if they exist. Clrmamepro calculates the hashes over the full file, so you need headerless files (and sometimes correct byte-ordering) to match.

Roman Scherzer
ClrMamePro