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I updated my InDesign CC application to 2022 yesterday, and was able to work on my file (after the update) just fine. I guess that my computer had apparently restarted overnight, because now I get the "InDesign might not support the file type, a plugin is missing, or it may be open in another application" message whenever I try to open it. It is not happening with any of my other files, only this one. The file, when I look at its properties, is listed as an InDesign 2022 document, which matches up with my InDesign 2022 application. I have only been working on it on this computer and in InDesign ONLY, and I have restarted my computer (and InDesign) multiple times. I have no idea why this is happening.
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Hey
Sorry for your issues.
Have you got any backups?
What is your OS and your system specs?
There's a troubleshoot guide here
https://helpx.adobe.com/indesign/kb/troubleshoot-file-issues.html
And at the end of the webpage there's an email address to send damaged files to see if they can be recovered.