These days there are probably more different types of file format than there are fish in the ocean. Actually, that's probably a bit of an exaggeration, but nevertheless the digital audio world is becoming an increasingly daunting place.
I find the best thing to do is hire the use of a file conversion app and transfer everything into one format. But with so many formats out there, it's difficult to find a program that can handle all these formats.
Peering at the list of supported formats in GermaniX Transcoder tells you that this won't be an issue, and I defy you to think of one that isn't included.
Conversion is a simple process in this app, and it's merely a case of adding the files to the task, choosing the output compression quality and hitting Start.
Despite the fact that many of its rivals offer many more features, GermaniX Transcoder proves its worth by offering support for a huge number of audio file formats.
GermaniX Transcoder supports the following formats
Input: MP3, MP2, MP1, WAV, OGG, AIF, MO3, XM, MOD, S3M, IT, MTM, UMX, CDA, FLAC, WMA, AAC, MP4, M4A, AC3, APE, MAC, TAK, SPX, SHN, LPAC, TTA, MIDI, MID, RMI, KAR, MPC, MP+, and more
Output: MP3, MP2, WAV, OGG, FLAC, WMA AAC MPEG-4 MP4 M4A APE and more