Editors...
 This command is used  to  create  and  maintain  the  editor
 extension file, which associates different editors with file
 extensions. This feature allows you to use different editors
 to edit files with different extensions.

 Lines in the VCEDIT.EXT file consists of the extensions, and
 the  commands  to  edit  files  with that extension (usually
 these commands are editors):

          +---- Extension
          |       +---- Insert file name and extension
          .       .
         asm: ne !.!
              @ cls
              +---------+
                Commands

 tells the Commander to run Norton Editor when  you  press F4
 on  a  file  that ends in .asm (such as "somename.asm"), and
 then to clear the screen.

 A comment line must contain symbol ' in first column.

 You can type symbol @  before  any  DOS  command  to  cancel
 output of the prompt and the command line.

 Here are all the ! arguments that you can use in commands:

   Argument     What                             Example
   --------     ---------------------------      ------------
   !.!          File name with the extension     filename.ext
   !            File name, without extension     filename
   !:           The current drive letter         A:
   !\           The current page                 \PATH
   !!           Insert the `!' character         !

   Notes:
     .  You  can  use  ":"  to  match  any  file  without  an
        extension.

     .  You can use DOS wildcard characters. So, for example,
        "*:" will match any extension.

     .  There  are  two  types of editor extension file: Main
        and Local. The main extension file is stored  in  the
        same  directory as the  Commander (or  the  directory
        given by  the  VC  environment  variable). The  local
        extension file is an extension file  in  the  current
        directory. This  allows  you  to  have  a  number  of
        extension files in different directories.

     .  Press Alt+F4 to use the built-in editor.