Pages and Numbers
When I tried to open Pages or Numbers file, I get a message "File is damaged and cant be opened. You should move it to trash." But I can open the file by opening the Pages or Numbers app first, then the file.
iMac 27″, macOS 10.15
Question marked as
Best reply
Usually, when Pages or Numbers informs that a file is damaged, it is game over. What you report is strange that it will allow you to open the so-called "damaged" file via the open panel. Save the file again, formally quit Pages, and see if double-clicking the same file still reports it as damaged, or not. If so, you might consider rebooting the Mac, and trying the same document again afterward.
There is a dedicated Pages for Mac Support Community, and one for Numbers too, for future posts on these applications.