I use a program called OpenSCAD to do 3D modelling. It saves its files as filename.scad
So now I want and .scad file to open with OpenSCAD, so: Right-Click, select Open With, select Other Application, and make sure the "Set as Default" box is checked.
Great. That works.
Later, I find that opening any .txt file opens it in OpenSCAD.
Weird. So I re-associate .txt files with notepad and check "Set as Default".
Now all my OpenSCAD files are opening in notepad.
It should be pointed out that OpenSCAD files are just text files.
So, how do I go about associating an application with a particular file extension instead of a file type, as it appears to be doing?