Have a file saved in Mac format and I could not see the audio files I saved in the Research folder in the Windows version. Also, I imported a MP3 and it didn’t show either. 
Do you mean they weren’t listed in the binder or just that you couldn’t load them and play them in the editor? Did you import the mp3 while in Windows? Thanks for any extra details; I’ll take a look at this as it sounds very odd.
They were listed in the border, but there were no buttons to play nor was there anything inside the Viewing area (is that what it’s called) Apologies, sleepy, brain escapes me.