No, Alt.binz uses its own PAR2 processing, and the unrar.dll that's in the misc folder, so you shouldn't worry about your Winrar install. Alt.binz appends an 'X' to duplicates, so it's likely that it has downloaded more than one copy for some reason (or you have
). Your detailed log should give you more information about exactly what was downloaded, when and why.
I only experience this problem occasionally when I run out of space on my download drive (d'oh!), and need to change dl folders and things get a bit foobared (my fault, usually). Deleting the original and removing the 'X' from the copy usually shifts it.
-Hecks