SolidWorks as default program for SLDPRT

Hello,

I am having trouble setting SolidWorks 2016 as my default program to open .SLDPRT files. I have tried to:

right click on the file and choose Open With

right click on the file and go to Properties and change the Open With

go in from the control panel and setting the default program associate a file type to

but I always get an error message that the file type cannot be associated with the program (SW16).

Very grateful for help!

SolidworksGeneral