BTW, can .WMA be used freely for Windows projects, or do programmers have to pay a fee to Microsoft?
Our content pipeline only supports producing unencumbered formats. This means we produce WMA, M4A or OGG because there are no licensing requirements for distributing files in those formats. This is why we do not produce MP3 files. If a developer wants to use MP3, that is their choice, but we will not help a developer to violate licensing by producing files in those formats.