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The AI extension is used by Adobe Illustrator. Some other applications can be used to edit such files, and Adobe Reader, Photoshop and Preview can view them. The AI file format was originally a native format called PGF. PDF compatibility is achieved by embedding a total copy of the PGF data into the saved PDF file.
To change the Open action of a file type, follow these steps: 1  Start the Microsoft Windows Explorer. 2  On the Tools menu, click Folder Options. 3  Click the File Types tab. 4  Click the file type that you want (that is, Microsoft Excel Worksheet) in the Registered file types list. 5  Click Advanced.hen you double-click a Microsoft Excel file type (.xls), Excel starts as expected, but then you may receive an error message that is similar to the following: When you click OK on the error message, the message reappears. After you repeatedly click OK, the file opens. C:\. .xls' could not be found.