In windows 10 Groove Music is the default music app and it won't change even if you choose WMP instead in default app settings. Auditioning tracks works fine in BIAB and I'm using the same ASIO drivers and default playback and record settings - EMU USB in both.

So I tried this. On the the RT picker page, I click on the little folder box - right bottom of transport, it takes me to the folder where the wma files are. I click on the instrument file there and Groove Music comes up with an error message that says this file is in use by another app. So i exit that and I click on play with WMP which comes up with a vague error message that just says can't play.

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