Your choices didn't indicate a difference between Poser 4 and ProPack. If Poser 4 users are using Pro Pack, then we don't have to worry about .RSR and .bum files, do we? I don't own Pro Pack, but my understanding is that only Poser 4 and earlier use .bum and .RSR files. So if everyone is using Pro Pack and up, do we need to keep including .rsr files, and support for .bum in our MAT files.

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