Answered
Using "Edit Original"
Opened an .ia file with inDesign. Attempted to edit original with Illustrator. Illustrator program opens but the file doesn't open. Already tried re-setting the preferences. What can I do to fix the problem?
Opened an .ia file with inDesign. Attempted to edit original with Illustrator. Illustrator program opens but the file doesn't open. Already tried re-setting the preferences. What can I do to fix the problem?
Try selecting Edit With under the Links panel flyout menu, then choose the Illustrator version that you want to use.
I hope it was really an AI (not .ia) file which Illustrator can open.

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