[ArthurCP]

Hello everyone.

Here is my problem:
Adobe Illustrator doesn't recognize .AI extension file. 
Saying: Error opening file

This happens on both my computers with one file. Any suggestions as to what causes this?
Thanks

[andrewsw]

Is it only happening with a specific file? If so then this suggests that the file might be corrupt.

Troubleshoot damaged Illustrator files

If not, then it might be to do with failed file assocations (particularly if you had an earlier version of Illustrator installed).

P.S. I know nothing of Illustrator or its files, the above information is garnered from Google.

[ArthurCP]

Many thanks for your reply. Yes only with a specific file. I could open it before.

[andrewsw]

Okay. (So presumably you are now reading the link I provided )