Re: opening a file * .ai an error "the operation can not complete because of an unknown error [x! Fd]"

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please refer Re: Adobe Illustrator - The operation cannot complete because of an unknown error [x!fd]

Hi Spikestrider,

To assist you further on this I would request you to please share the following details:

Operating System(Exact Version of MAC)

Exact Version of Illustrator.

Where are the files saved? (System folder/ Shared folder/ Network drive/ External HDD)

Save a new file to desktop and check how it works?

Check how does it work in safe mode? Use safe mode to isolate issues with your Mac - Apple Support

Looking forward to your response.

Regards

Srishti