Apparently it somewhat works on XP but with very limited choices of MP3 quality. The one I saw has a max of 56kb. With this choice, you're better off making your own MP3 with an external converter.

The manual says the MP3 codec must be installed on the system. I use Lame with the only requirement that it is the path so programs can find it. I have it in my Windows directory and BIAB apparently does not see it. Maybe someone else can test and verify. Regardless, the bug in Vista should be investigated.

Rachael