Windchill 10.1 and AE 6.1 User is trying to compare an xml file within windchill with a revised xml file that was outside of WC. User has attached the revised file to the WC xml notebook. When the user tries to open the attached revised xml, it opens in a browser instead of AE. When the user chooses to open the attached xml by going into "actions, open with, AE" the original xml opens and not the revised attachment. Note: The original xml file in WC opens in AE when user clicks on icon. It appears that WC recognizes AE and launches correctly for all xml documents except for xml attachments. Under the Firefox options menu I have tried to add a generic xml viewer to see if this would resolve the issue. Firefox does allow the add-on. Has anyone else experienced not being able to open xml attachments? How do I get the attachment to open in AE?