@helmut_meukel
So just start your old version of MS Word (if it's still there) as you would do to create a new document, then try to open one of the apparently changed documents using MS Word's menu (File; Open...). If the document opens, then you only have to go into Windows Settings and re-associate the file type (the extension) to your old program. Done!
Don't panic, stay cool.
HM.
ETA.
You probably can still use your old MS Word to open a document by right-clicking on the document and selecting "Open with...". The program list shown may still contain your old Word.
All good advice. I have multiple Hard Drives and Thumbdrives with back-ups of my documents. I am NOT loading them onto my laptop until this matter is resolved.
In my Start Menu there is an Icon for MS Word but there is Nothing else of the program.
I have since discovered that Microsoft changed the conditions of my ownership of MS Word and Office 365. In 2014 when I retired from the US Army, I began using some of my GI Bill benefits. I bought a new laptop and a copy of Office 365 for students to comply with course requirements.
Long story short, Microsoft technicians spent more than 24 hours remoting into my new laptop (I had nothing but the recently purchased MS Office 365; I had no chance to put any other software or PII on the computer). I took it to one of the last existing Microsoft stores (since closed) and after another three hours the manager, in desperation installed a "Full" copy of Office 365.
I was told that MS had spent more hours (money) trying to "fix" my laptop/software issues than the program was worth. I supposedly had a "Lifetime" (of the laptop) license to Office 365. I am still using the laptop. It seems Microsoft has deemed that I now need to start paying for Office 365.
We checked my MS account to discover this.
What really shocked me is I had updated my computer, then took it home. I had been operating it. Shutting it off, and turning it back on several times at home, where I don't have internet. So, I was shocked when this happened.
I am able to access the Forums via my phone, but there is insufficient signal strength to use my phone as a "Hotspot" According to recent reports the tribe has negotiated to have more internet infrastructure installed; starting with the tribal HQ and Tribal school. By the time such upgrades are near me, I will have moved (I am waiting upon the availability of an apartment near Bellevue, WA, many miles from where I am currently living. (Suffice it to say there are a multitude of reasons that it is not practicable to move on short notice, and it is worth waiting to move into a complex where a friend of mine is already living.)
Thanks for the advice!