(TXT) Text link
 (DIR) Directory
 (ERR) Error
 (ARC) Zip file
 (BIN) Download
       This line just doesn't link to anything, right?
 (GIF) GIF image
 (IMG) Image
 (DOC) Document
 (SND) Sound
 (???) Video
 (???) Calendar
 (???) mailbox
 (HTM) Link to a local html page
       
 (QRY) Search engine query
 (TEL) Telnet session