- (FILE)
- An ASCII file
- (DIR)
- A directory listing
- (CSO)
- The Computing Services Organizations nameserver
    interface
- (BIN)
- 
      A binary file with one of the following meanings
      
        - A Binary file with PC extensions
- A Binary file with UNIX extensions
 
- (HQX)
- A Macintosh file that has been BinHexed
- (?)
- A searchable database
- (IMG)
- An unknown image type
 You must have an X terminal to
    view images
- (GIF)
- An image in Graphics Interchange Format
 You must have an X terminal to
    view images
- (HTML)
- A World Wide Web hypertext file
- (TEL)
- The link will open a connection to another host using
    telnet
- (3270)
- The link will open a connection to another host using
    tn3270
- (UKN)
- An unknown or unsupported type