Andrei, I have the same question. I recently added (for the first time) some mp3 files and they played fine from OCDC via Windows Media Player. That is not my player of choice, however. I use various players such as Winamp, VLC and Orange CD Player. When a friend shared some m4a files with me yesterday, WMP could not play them. I converted them to mp3 files and it still refused. It's frustrating!

Where is the option for me to designate another player for playing media files in OCDC?

Thanks.