I did actually see that one yesterday too, but the file path they talk about appears to lead only to third-party start-up item context menus: Dropbox, Eraser, 7-zip, etc. (There are also two labeled only with long alpha-numeric strings, but I don't understand anything about that.). However, I did just notice more information in the comments that I overlooked previously, so it was still helpful.
I went ahead and searched for "systemfileassociations" in my registry, since that was the subfolder I was looking for, and since one of these guys in the comments also mentioned it. I couldn't find the right path yesterday given another set of directions I read, but the comments and search turned it up.
Unfortunately, the search turned up two locations that look almost identical. Here's a picture, since that's easier than words:
If I take the commenter at his word, then it seems I want the one inside the LOCAL_MACHINE directory instead of the ROOT directory (the previous directions I saw also had it under L_M). Furthermore, using the context of the things highlighted in the picture of the "recommended downloadable solution" in your link, it seems I want to delete the topmost keys (the one which start with @%SystemRoot%\system...) in order to do the deed. So it seems we might have the solution, although I should note here that the commenter in question was actually the OP, and he ended up choosing the auto-solution to do things for him, so who knows if he has a clue. (It reads like he was just another me, someone who did some reseach, and found this stuff that seems about right, but who doesn't really know much more.)
Also, the almost identical nature of the two separate locations has me wondering... "Sup with that?" I've been curious about this before after poking around in the registry, and I find myself being really curious now how these registry directories work, i.e: what the difference is between ROOT and LOCAL MACHINE, and why there are so many identical-seeming entries in various different locations. Is there any quick "gist-of-it" explanation you (or anybody else reading this) could give me or point me towards?
Also, predictably, since I got me my inch, now I want me a mile: would there be any way to just MOVE the entry in the drop down menu so that it's not in between my two edit locations?
That would be the ideal solution here, as it's the placement that's the problem, not the option itself. The option is useful, but I'd like it to be somewhere away from my high-traffic areas, since it's not undoable and doesn't ask for comfirmation. Say, in between Cut and Copy, since I never use the menu for those. (Note that, within a Firefox environment at least, it does ask for display options before implementing, thus allowing you to cancel; this would be another fine solution for the explorer enviroment.) It does seem increasingly likely that this would involve adding/customizing registry entries, which is pretty sophisticated assuming it's even allowed by Windows, but I'm hoping there could be a way. (Meta-question: Is this the right/best forum/section to be asking about things like this? There are a lot of "computer help" forums on the internet, and I just kind of picked this one for no real reason without knowing the difference between them.)
The thing is, I still want to change my desktop background; in fact I do it fairly regularly. I just don't want it to keep happening so frequently by accident. It appears this soluton may disable that option completely, so I wanted to double-check if that's the case before deciding if I want to take this step. (If I can still change desktop pictures within the Personalization control panel environment, that would be fine, but if not, then moving it within the menu if possible would be far preferable to removal.)
Thanks again for all your help.
Edited by Sage_Lee, 15 April 2017 - 04:57 PM.