MS Word documents changing to .cpio files and then to .zip files
Solution 1:
When a document opens with the wrong app the first thing to do is see what macOS thinks should happen.
- In Finder find a document
- Right click on it and choose Get Info
- Look at what
Open with...shows - If it is the wrong application alter it to be the correct one e.f. Word in this case. You might want to Change all as well.
- If it is the correct app then more investigation needs to be done.