.MIME File Extension

Encoded file used by email programs; contains 8-bit encoded data, including characters other than the US ASCII character set; used to support file attachments and a richer character set instead of standard 7-bit messages that are normally sent over email.

MIME files can often be decoded using a file decompression utility if they are not first recognized by the email program.

MIME files are more commonly seen using a .MIM extension.