When I open a file in Inventor 2013 I get the error message "cannot open XML file" for 20 or more files.(See attachment) This has only been an issue since 2013 was installed. What do I need to do to correct this? Thanks
Check your project file.
It looks like your project file is pointing to the wrong location for the Design Data folder.
If Inventor was installed with the Design Data in a location other than the default location, you will need to repoint to the correct location.
check project file and Application Options > Files tab. App Options controls this unless it is defined otherwise in the project file. The default location is at the Design Data folder level-- my installation, at least, doesn't have a folder named "XLS13" under it.