What is a set file and how do I open a set file?
SET files store configuration settings and other preferences for various programs. They are loaded by the application when the program is opened. Programs that use SET files include Corel Painter, Autodesk AutoCAD, Nikon Capture, XANA browser, Sibelius music notation software, Diablo II, and Alpha Five. SET files are referenced by their programs and should not be opened manually.
Relevant set file links:How to open set file on Youtube
How to open set file on Wikipedia
How to open set file on Microsoft.com