Modulos - mod_autoindex 

AddAlt
    AddAlt "PDF" *.pdf
    AddAlt "Compressed" *.gz *.zip *.Z
AddAltByEncoding
    AddAltByEncoding "gzip" x-gzip
AddAltByType
    AddAltByType "TXT" text/plain
AddDescription
    AddDescription "The planet Mars" /web/pics/mars.gif  
AddIcon
    AddIcon (IMG/icons/image2.gif) .gif .jpg .png
AddIconByEncoding
    AddIconByEncoding /icons/compressed.gif x-compress   
AddIconByType
    AddIconByType (IMG/icons/image3.gif) image/*