Apache Reference: mod_autoindex, AddAltByType

AddAltByType

Alternate Text for File Icon (by MIME Type)
Syntax: AddAltByType text mime-type [mime-type ...]
Example: AddAltByType "HTML" text/html
Since: Apache 1.0

This directive sets (one or more times) the alternative text to display for a file with the MIME type mime-type, instead of an icon, for FancyIndexing. The mime-type argument must be a valid MIME content type. The text argument is enclosed in double quotes. This alternative text is displayed if the client cannot show the image or has image loading disabled.