Hi Cale: It is just ASCII format. You can open it in notepad or word (i usually append a *.txt to the end of a copy of a *.geo file just to open it and read it).
For displacement command syntax: if you run a menu command: "Loads/structural/displacement/define by node" using the mouse, a dialog will open and show you the command syntax, and, the command interpreter will list the command input that you just "clicked". From what I recall, the syntax for defining displacement on a node is something like: "DND,<beginning node number>,<displacement component>,<value>,<ending node number>,<node number increment>, <optional displacement components>". There is also a Help button on each menu that lists the synatax. If you need a PDF of all commands, I am fairly certain you can still get that, but you'd have to contact your VAR and ask them to send it to you. Hope that helps.