Ah, thank you!!
I had looked in that folder, but I had missed the two other folders in the AppData\Local labeled "Chromium" and "Chromium2". I have not been able to test the bookmark files at this time because Iron has suddenly stopped working earlier today, but I notice that one of sets of bookmark files is dated 11/23/2009 and that one should be the one I am looking for.
Both installs of Iron are on the same machine so I am puzzled why it would create a second folder and label the original as Chromium2... I guess it makes sense to someone.
I am going to try manually copying the bookmark file onto my laptop and check it, hopefully it is the one I have been looking for!
I believe this machine is due for a format and reinstall of windows, there are far too many issues cropping up at one time for it to just be coincidental that Iron has stopped working at the same time IE7 became corrupted.