Thanks for all the helpful suggestions! Here's what I did and learned:
Using the Restore Wizard, I tried ALL the options: "Restore All", "Restore Customizations" and "Restore Project" twice each, once with the "use without saving changes" button checked, and once with "save as a new configuration" checked. These each immediately gave me a popup box that said "DynaZip UnZIP Error: Zip file structure invalid".
After clicking "Okay" to each DyanZip error, I was taken to Step 2 Data. when I click "Next" however, a box comes up from The Master Genealogist that says "The selected backup file cannot be restored by the current version of The Master Genealogist. It may be an older backup format that is supported by the Import Wizard however".
In the Import Wizard, I tried simple and advanced Wizards for every genealogy program that used a (*.SQZ ) file type. The results were:
TMG v 4.x or earlier = red message saying "File *.tmg not found"
Family Gathering Backup, Roots IV, Ultimate Family Tree, & Visual Roots all say "Cannot find event library (V-ELBook)"
1. Does this tell you anything about what program held this data originally, so I can narrow down what I'm trying?
2. Should I be trying to find someone running a really early version of (some program?) that could perhaps open and export the data for me?
3. Or, could the floppy be too old to yield data?
Thanks for your thoughts on this. I'm game to keep trying if there's something to try!