If do the experiment (relocate the .wmas) on just one folder so as to keep the number of files I have to relocate to a manageable number, then of course RB will use the .wavs in that folder...that's all it has to choose from.

But in order to be sure RB is then using .wavs in all instances, I would have to move all the .wmas out of the relevant BB subfolders. That would be...let me see...umpteen million files. No thanks.

I still think there has to be a setting somewhere to specify the use of .wavs rather than .wmas. If not, I'm hoping a PG rep will chime in here and definitively tell me that it happens automatically.

Thanks to all who responded.