What are the most common causes of 'An unknown error has occurred' when opening an Illustrator file?

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Grade: Education Subject: Support
What are the most common causes of 'An unknown error has occurred' when opening an Illustrator file?
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Several factors can trigger this error. Common culprits include corrupted files, outdated or damaged Illustrator installation, insufficient system resources (RAM, CPU), conflicting plugins, file permissions issues, or problems with the file format itself (especially if it's been edited in another program).