Hello, I see. I agree that such file is not useful out of the box, and personally I have no objection to removing it (can't wait for mailcap to disappear :D). But once fixed the file is probably not harmful either, and it can be useful to a user who is willing to add the corresponding entries to /etc/mime.types or ~/.mime.types manually (for example if you have a mailcap-based file manager, and you want to make it open .ab1 files). I'm not familiar with the registration of media types to IANA, so I'll leave the decision to you.
Thanks, MNZ
