I found the solution: caber.exe will dump the contents of thingy.cab into a folder called thingy and any registry changes in a text file named 00thingy.000.reg file.
It's at the bottom of this page:
https://brain.fandom.com/ja/wiki/CAB%E5%BD%A2%E5%BC%8F%E3%81%AE%E3%82%A2%E3%83%97%E3%83%AA%E3%82%92%E5%B1%95%E9%96%8B%E3%81%99%E3%82%8B
Translated--err, paraphrased--install instructions:
Quote
1. Download the zipfile containing caber.exe
2. Download CAB32 , extract it, and copy "cab32.dll" to the folder containing "caber.exe"
3. Start "caber.exe"
4. select the *.cab file you want to extract, and press "Execute!"
5. A folder with the file name will be created in the same folder as the *.cab file, and the file will be expanded into it. Registry changes will be put in a .reg file.
caber.exe runs fine under linux in wine.
I can just attach a zip file of the exe and dll if it isn't a federal offence. But I don't know if this is free/abandoned software....
