# Who decides if file format is popular enough to have its own MIME type

file formatmime-types

Who decides, if a program is popular enough to have its own MIME type?

Right now, I program something for dealing with .srt subtitles – and while on wikipedia, it has application/x-subrip MIME type, nothing like that is seen in the official IANA MIME list.

How is that determined? Who decides, if srt is popular enough to have its own listing in IANA MIME list?

• If you follow a few links from that IANA (MIME) Media Types page, you'll find RFC 4288, which describes the process. There are at least four "trees":

• Standards
• Vendor
• Personal/Vanity
• Experimental