I have doubts that you are working with InDesign version 9.x, you are still on version 8.x and are trying to open a 9.x file. When you got to about InDesign (InDesign menu on Mac, Help on Windows) you will exactly see what version you are using. More details are given if you hold down the Command-key (MAC) or Ctrl-Key (WIN) when you go to About InDesign.
That's not the typical message for opening newer files.
Are you able to open these files from the file menu? How about if you move them to the desktop?
Thanks for your help. I am working on the 9.2 version Willi.
I am unable to open the downloaded cs6 files on their own, even from the file menu, as the error message appears, but today they are no longer in faded type in the folder, and I am able to click on them and drop into a new indesign file and resave.
So thank you for your help.
what, exactly, do you mean by "I am able to click on them and drop into a new indesign file"?