I did a google search and here are a couple of free wma to aiff and wav to aiff file converters.
It looks like it is a batch conversion.

Don't ask as I don't have any experience with either.

https://convertio.co/wav-aiff/

https://www.freeconvert.com/wma-to-aiff


Why is it that doctors call what they do 'practice'?
If flying is so safe, why do they call the airport, the terminal?

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware