As the ConversionThingy 2 program is my progeny, I'll throw in my responses here, as well. In order to avoid duplication, this comment addresses a couple of the inquiries in this thread.
Larry: It's entirely possible/probable that you're not doing anything wrong. It's unclear from your note at what point of the process something is failing, but I think it's probably fair warning to any prospective user of the program that ConversionThingy 2 isn't an infallible solution--that's a premise I've been working with since I wrote the program, and it's probably worth stressing. When it works, it's a thing of beauty and a welcome solution to a present problem. When it doesn't work, um, sorry. Documentation for the program is on the site itself-- http://www.conversionthingy.net/ --the "Converting Archives" document in particular might answer some questions. As the program's primary functionality is ANGEL-to-Moodle conversions, most of the documentation speaks specifically about ANGEL conversions, but in many instances, the recommendations (and potential issues) are interchangeable. The program's "Feedback/Contact" button (on the license page) lets you contact me directly if problems arise: I don't promise solutions, but I'll offer them if I've got them.
Ben: Moodle 1.98 is specifically mentioned in the ConversionThingy 2 documentation because that's the version from which test files were drawn during the programming. It may work with 1.94: I've not tried. I'd recommend testing the program on a couple of 1.94 backups to see whether it produces intelligible output. Depending on the outcome, choose one of two courses of action: if it works, super; if it doesn't, wait for Moodle 2.1(?) to sort out the routines for contending with 1.9x course backups. I would not, under any circumstances, recommend pushing your site through an interim Moodle upgrade just to get to ConversionThingy--fond of it as I am, the program can't, doesn't, and won't promise unmixed results.
Mary: I'm so glad it worked well for you.
Glenys: For posting the link, here and elsewhere, merci.