In the Open dialog boxes, a particular type of document is listed by default in the "Files of type" box. You can change which type of document is listed.
To define the default open document type:
1. Choose Preference ® Options,
File.
2. Click Input.
3. From the Open File Type list, select which document type to list by default.
4. Click Save. Click OK.
The selected document type will be listed by default for the next document you open or import.