I've been trying to associate .php files with Sublime Text 3 for the past few days, in Windows 10. I right click on the file, go to Properties, and under the General tab, I try to change the program which it opens with, which currently, is nothing. It doesn't change, and still shows, "Pick an app", next to, "Opens with:".
I tried to then associate it with Notepad too, in a similar manner, without any success. Suggestions from questions like this indicate some changes in the registry, which I have tried. I've rebooted my laptop after nearly every regedit, just in case. I've also checked if I could change or set file associations for other files, and I failed again, with .css. However, .mp4 and .bmp associations seem to be changeable, no issues (between VLC and Films & TV, and Photos and Photoshop, resp.).
Windows build is 1803. I only recently hard reset my laptop, so I'd like a solution which is a bit less drastic.