Thanks Russ and Jang.
Indeed, I figured that such a script would be extrememly difficult, if not impossible, to create. The automation isn't critical for me to have, but it sure would be interesting to see and I think it would help me get a better handle on ExtendScript.
As for the Open() method, I've tried all sorts of different variations of it with no success. I've tried using GetProps(), GetOpenDefaultParams(), etc. to get the propVals on an existing document of the kind I want to be able to open, but I can't seem to pull them up. The dearth of supporting documentation for ExtendScript is killing me. 
Russ - I don't suppose you could show me a working sample that uses the Open() method?
Thanks again, guys.
//C