Any one know how to reset or remove setting specifying what program to use when opening a file type?

I was going to open SLDDRT file from Windows Explorer; browsed to SOLIDWORKS.EXE > open > checked always use this program to open this file type> OK

Problem is SOLIDWORKS does not open in the available program list when it is selected... (that's for another discussion)

I did not notice this until I had already clicked on OK and checked the "ALWAYS use this program when opening this file type" box...

Now every drawing that I create become corrupted.

Does anyone know how to disassociate the Adobe program with this file type?