Windows 10: setting default icon to display for specific file types with registry

Something in Windows 10 or another program has created an issue that I cannot find any way to fix. I tried the normal things for setting the default program. Both by using properties on the files as well as using the Windows Default App settings in every combination i can think of.

File types (png, jpg, jpeg) that I have chosen to be opened by the Original Windows PAINT program will only show a generic "image" icon on desktop and in folders. I also noticed that .txt files now only show a blank page with lines instead of the Notepad icon that was always displayed beneath items that have Notepad as the default editor.

However, If i change the image files to use Paint-3d by default, the icon for Paint3D displays. If i change .txt files to use Wordpad by default, the icon for Wordpad displays. It has been this way for the past several weeks at minimum, perhaps longer.

The icon for the program MSPaint still shows the original icon as it should and Notepad also still has its original icon for the program.
I know where to go in the registry to change the icon associated with a file type. When i checked there, Jpeg files are set to use "imageres.dll,-72". Oddly, .png files are set to use ,-83 but on my screen they look identical. Txt files use imageres.dll,-102.

As I have never had to resort to this much trouble to achieve what was once the normal setup, and before I do anything I wondered if this is the "new normal" or if it was caused by something 'malicious'?

:)

 

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Hello -
Thanks for the return. Before I undertake changing the Registry, I have a question.
The steps in my Registry, for my version of Windows 10, were a bit different, but I think I eventually got to the right spot.
The last step is to change the number of places you want to list in Recent Places. In my case, the default Max Display listed 50 as the number. So, if I were to change that number, how do I know the Save As page will be one of those places? Or, a similar question, will this registry change delete the tab Recent from my Save As page? This is what I would like to happen.
When I received my computer in Nov. 2016, the Recent tab was not listed in the Save As page. Something caused it to be added over time. Which brings me to this second question. Would there be any benefit in deleting the changed registry listing and reverting back to the default listing? See attachment.
Jerry