Architecting and designing
  
LST extension
Type the name of the list file in the file name box, using an .LST extension; for example, NEWLIST.LST. The default extension for your new file is .LST. The name should be assigned to give some hint as to the purpose.
All .LST files are comma separated value (CSV). Use any text editor to read the contents.
Modifying a .LST file might render it useless to System Architect.