We frequently used OpenOffice/LibreOffice to open Word files that more recent versions of MS Word couldn’t. It was my go to program for all kinds of office document problems.
I haven’t used it in a few years but creating a macro to do open & save shouldn’t be too difficult.
I’m currently working on converting a bunch of old MacWrite files using LibreOffice. I never did get the automation to work properly but I can open each one pretty fast using keystrokes, look at it to decide if it’s worth saving and then save with a few Text Expander snippits and a bit of typing into readable files. I’m almost done with this batch. Then I get to go bring in a bunch more archive/backup CDs and check them.
Part of a major project to move all relevant data up to modern formats and then put out on as AWS Glacier archive.