Hi There
In the file properties box
The MIME types in white are not valid
Green MIME types are Valid
The Audio MIMES are given as examples
You can however upload audio files using Cook by creating your own
- hit the + sign to add to the list
- input standard mime types for audio
start here
MIME TYPES LIST
However if you intend to use it for a production site
- use the fork files to extend your validation process do not rely on just MIME identification
- personally i suggest you do not rely on Cook alone to provide MIME validation
- Google and implement a stronger Audio File validation using the fork
and one final note
remember MIME validation issues can also be browser, server or client specific
Anyhow hope it helps