Symptom

When trying to open a BarTender file, the user receives this error: 

Environment

 BarTender 2016 (and likely others)

Fix/Answer

The label file has been corrupted. If you open the location where the label file is, you likely will notice that the size is 1kb, and that if you open the label file in notepad, the label file is actually empty. Something has corrupted the label file to a point that it is completely empty inside. This label is now unfortunately unusable.