Which version of ID? OS? Have you verified the file is not damaged and will open either on another machine or directly in Pagemaker?
How about in another user account?
I tested two p.65 files (one created on a Mac, another on a Windows machine) and one .pmd file (created on Windows PageMaker 7):
- all three opened without problems in InDesign CS3
- none opened in InDesign CC (same error message you mentioned)
Unfortunately, I had recently uninstalled the ID CS6 version from my system; otherwise, I could've tested which behavior occurred in the previous version.
You can reinstall CS6 from the cloud as a CC subscriber.
ID CS6 v.9.0. Windows 7. On the other machine (Win7), I have ID CS6 v.8.0. Only difference. Must matter, I guess? Can I retrograde (is that the term?)?
Version 9 is CC, not CS6. Completely different program...
You can have both installed at the same time.