2.3.15 AddAltByType
AddAltByType specifies a character string associated with the MIME type to be displayed instead of the icon when the directory index is displayed.
Description
AddAltByType displays character strings associated with the MIME type (for example, text/html) when the directory index is displayed in an environment where icons cannot be displayed. You can specify multiple MIME types for one character_string. If you specify this directive more than once, you cannot specify different character strings for the same MIME type.
Syntax
AddAltByType character_string MIME_type [MIME_type ...]
Locations where it can be written
httpsd.conf, <VirtualHost>, <Directory>, and .htaccess
Overwrite permission
Indexes level
Example
AddAltByType "plain text" text/plain