Solved: Can't save arrowheads.ai file to create custom arr... - Adobe Support Community - 10100752
Error: The file may be a read only, or another use... - Adobe Support Community - 9544003
Can't save after edits in Acrobat 10. "File may be read-only or another user may have it open" (Edit PDF)
Illustratro CS6 suddenly won't open ai files - Adobe Support Community - 10871719
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How to fix Error -54 (Can't save the illustration) - Can't save the illustration. The file may be read only, or the file is in use by another application, or you do
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Solved: Can't save: "The file may be read-only, or another... - Adobe Support Community - 9804604
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Illustrator could only partially read this file - ... - Adobe Support Community - 10721486
9 ways to minimize file size in Illustrator Astute Graphics