Symptom

When trying to open a BarTender file, you may receive the following error message:

Error Message #3323: The file '[file path]' is not a supported file type. 

Applicable to

 BarTender 2016 

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.