InfoPath Dev

When I go to run my forms sometimes, it simply pops a message box up that says "InfoPath cannot open the selected form." and then exits. There is no error information given, nor does it even get to the form load event. Anyone else ever seen this or know the problem?

Hello,
This message is one of the most frustrating in IP because it give no debugging information.

If you are getting this when trying to open an XML file, one thing you can try is opening that file via Preview to see if it loads. That might give a clue.