Print Organizer Key-in - How can I add multiple/all files in a folder. Please Help. Thank you.

I'm writing a script file to print all DGN files from a folder to PDF. Unfortunately, PRINTORGANIZER ADD FILE command doesn't do wildcards. Aside from psets or having to type in all the files manually in the script, is there any other way to add all the files from one folder to the list? Please help. Thank you.