Answered
What does .crypt at the end of an INDesign file mean?
Why can't I open these files?
Why can't I open these files?
I don't know if any such file extension used by InDesign. It seems your computer is infected with a virus. See the following link
https://fileinfo.com/extension/crypt
Running a proper virus scan should be the first thing you should do.
-Manan
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