I don't even know how to describe this problem?

I'm having some issues opening some files from a shared network that all my coworkers have access to, and I seem to be the only person having trouble with these files. I get an error message claiming that the files were created with a newer version of Indesign (despite the fact that I have the current version, and these files were probably made with either an older version or the current one.) They'll appear either of these two ways.

For a while it gave me an option to convert the files and that worked fine for a while, so I shrugged it off. Now I'm getting an error message saying that the conversion services aren't available. I am logged into creative cloud. Trying again later changes nothing. These files are now completely inaccessible to me.

Also the extension on these files don't say IDML. They should just be INDD's.

This has only been an issue for me concerning ONE specific folder on this shared network. Every other Indesign project on the network, or my own computer, I can open just fine, without issue. What's puzzling is that my coworker can open these SAME files that won't open for me without any of these errors, so I don't think that they are corrupted. We're all using the same version of Indesign.

I'm running Indesign CC 2017, recently updated to build 12.1.0.56 on OSXYosemite 10.10.5.

I checked to make sure I didn't accidentally have two versions of Indesign installed and I do not. Not sure what to try next. Prompt help would be much appreciated.

Thanks!