Apache Reference: mod_mime, AddType

AddType

Associate MIME Content Type with File Extension
Syntax: AddType mime-type file-ext [file-ext ...]
Example: AddType image/gif .gif
Since: Apache 1.0

This directive maps a given file name extension file-ext to the specified MIME content type one or more times. The mime-type argument is the MIME type to use for file names with the file-ext file extension. This mapping is added to any already in force, and it overrides any existing mappings for the same extension. This directive can be used to add mappings not listed in the MIME types file (see the TypesConfig directive).