"Not Implemented" when clicking on photos in Windows Explorer

I think I may have found a fix. Not to the problem, but just a fix to be able to open my photos.

I opened the current Photos app, went to settings within the app window, scrolled down to where it has an option to download and use Photos Legacy and downloaded it. Once it was installed, I clicked on any photo and that asked my what app I wanted to use to open it. I chose the Photos Legacy app and then checked the box at the bottom to make that my default. Seems to be working so far.

We will see how it shakes out in the long run, but THIS solution worked for ME. Everyone's computer is different, and I don't even know what was causing this issue in the first place, but it worked. I would encourage people to try this solution and see if it works for them.

The reason I have high confidence in this solution not being temporary is that it resolved the "not implemented" error during my current session of Explorer, ie not having to restart it from task manager. Nothing I have done prior accomplished this. Seriously, all I did was confirm I was still experiencing the issue in my current session, install the legacy Photos app, set it to default within settings, and ta da all my photos opened normally again.

I did try the default viewer trick with the current Photos app, and this did not work. It was after reading people saying that still didn't fix the problem even after reboot that I went with the above solution. It's a good thing I didn't reboot too; it wouldn't have given me the immediate gratification of the issue disappearing with the install of legacy Photos. I'm also not particularly keen on the redesign, problems aside. So I have no qualms with reverting. :)

If this solution does solve people's issues permanently, then it's clear the issue arose from the recent photos update. I don't know how I started experiencing it BEFORE installing the update, but maybe Windows implements some changes in an update before you actually restart to install it. I can't remember if the UI change had been implemented before or after I installed the update, and before or after the issue arose.

I'll keep posted if this solution sticks, but I'm optimistic.

I am having the EXACT same problem as described. Take the .jpg out of a folder and put it on the desktop, then photos opens it with no problem. BUT THIS SHOULDN'T BE NECESSARY! Microsoft fix it so Photos opens the file while in the folder (like it use to before the update)!!!!

LookinAround No my default was not reset. I ended up installing "ImageGlass" which is an opensource image viewer and set it as my default viewer. While the issue with Photos remains it is no longer an issue for me and I don't have to spend more time on this.

Thanks for the note about Windows restore point. I thought that was the case, but the support person made it sound like it was a full computer backup which I didn't think it was. I may still try that to see that it resolves the issue, but Microsoft doesn't care so what's the point.

Just to double check you said you installed KB504554 and there is no such update. Did you mean KB5045594? This would at least identify the exact update that is causing the issue.

And I'm also running Windows 10 Pro x64 - 10.0.19045 Build 19045

Shaarmen There is no permanent fix for Photos as best we have determined. A temporary fix is to restart explorer. Most people have given up and moved to a different product like "Photos Legacy" as described by DamonB23 or "ImageGlass"](https://imageglass.org/release/imageglass-9-1-8-723-55 "imageglass.org") as I have done or they are using a product called Explorer++ as [LookinAround mentions.

Sorry. Yes. It's KB5045594. I fat fingered a typo (Or is it skinny fingering when you drop a digit?)

My About your PC in Settings shows

Edition Windows 10 Pro

Version 22H2

Installed on ‎3/‎22/‎2021

OS build 19045.5073

Experience Windows Feature Experience Pack 1000.19060.1000.0

Used Task Manager to highlight Explorer process, rt clicked Open File Location then looked at Properties of explorer.exe It shows

File version: 10.0.19041.5073

Modified on: 10/24/2024 !!

The problem didn't show up on my PC till 11/5. I must've opened pics using Explorer before that. For whatever reason, the reset app default / reboot solution continues to work on my PC. <fingers crossed>. I think your solution is perfect till M$ finally fixes things. Will go that path myself if it returns.