Have you tried photorec on them? The deep dive tool in the suite that I can’t remember the name of will ignore the missing MBR and just look for file markers in the raw data. I’ve only ever used it on Linux but there is a Windows version too.
You can run it ona copy of the image to protect the original
I also vaguely recall a tool called zipfix for broken zip files that will allow you to extract all but the broken parts.
I tried but it can’t find anything, probably because of signatures. It’s just some text files (no header) and that could be found with the hex editor but then there’s an executable inside to interpret them. Being that old I don’t remember what program is that.
Maybe I should find that image and post here if someone has it
You could creating an image of the drive under Linux, using dd. Then the recovery could be attempted on the image (assuming it does not contain sensitive data and can be shared).
For your information, in case your curious, a similar interface (that I use) is: https://cowlark.com/fluxengine/doc/building.html
