Hi Mark.
There are times when a valid AI file isn’t selectable by default.
You can choose “Show All Files” in the File Open dialog
in order to select any file.
On the Mac, find the “Enable” menu and select “All files.”
On the PC, find the “Files of type” menu and select “All files.”
Then select your file.
Let us know if you have more questions.
Matt Rhodes
Zaxwerks, Inc.