I don't know what "generic screen display" Dov was referring to, but the files are still there. You just can't access them because of the Flash "envelope" in which they are located. If you remove this "envelope" though, the file will become a normal PDF file with the original files attached to it and you'll be able to open it in any version of Acrobat or Reader.
To do so requires modifying a deep setting of the file, which Acrobat doesn't allow you to do, unfortunately, but it can be done using a stand-alone tool, like this (paid-for) I've developed:
If you run the command-line utility that's a part of this tool on your portfolio file it will revert to being a "normal" PDF file and you'll be able to save the files embedded in it as individual files.
I can open some old Flash-based portfolios without trouble; I don't need any converter. However, I no longer see the original interface, but simple a straight-forward list of the documents in the portfolio (I assume that is the generic screen display in question).