I regularly introduce all kinds of new, obscure file extensions to my system. For this explanation, I do not have any association with .xyz files.
Say I create
file.xyz. It has the default dog-eared page icon (first in shell32.dll) because it is unassociated.
If I double click it, I get a prompt regarding how to associate it.
After clicking "More options", there is a bunch of programs which are suggested.
I have some 30 suggestions for file extensions never seen by my system. For the most part, I just want to associate them with Notepad2, which is near the bottom of the list. I don't think I have ever wanted to open any file with my graphics driver UI.
Where is the list of these suggested programs, or how do I remove some of them?