Windows 10: unable to choose a default app to open a file type

OS Name: Microsoft Windows 10 Education N
OS Version: 10.0.18362 N/A Build 18362

7/‎17/‎2019 Feature update to Windows 10, version 1903


I restored file mapping to default via Default Apps Setting "reset to Microsoft recommended defaults"

Now "open with" context menu is missing "more apps", so I cannot browse the file system to choose the application to open a particular file type.

Furthermore the "Choose default apps by file type" setting only allows me to choose the existing application or "to look for an app in the Microsoft store"

How do I restore the ability to map a file type to an application on my filesystem?

:)

 

choose default apps by file type

When going to Settings / Apps / Default apps , I am unable to choose default apps by file type, ie the file type boxes ( .bmp .gif etc ) greyed out "Choose a default" missing. This means every time I click a bmp or gif file I have to select what app
to open it with .

 

Unable to change Default Apps by File Type


I'm trying to stop PDF files from opening in IE11, I want them to open in Adobe reader. When I go through the settings menu and get to the screen "Choose Default Apps by File Type" I cannot scroll down that page it stays locked on the top section. A screenshot is attached. Any idea of how I can get down to the PDF file type to change the default?

 

.iso extension missing from settings/choose default apps by file type


This ties partly into my other issue of not being able to mount ISO files in windows explorer. I am getting no luck on fixing that separate issue, so maybe if i tackle it at a different angle, the other problem could be solved as well. Please do not move this issue to Virtualization.



The Issue

Basically, in my "Choose default apps by file type" settings window, the .iso extension is missing. I am running Windows 10 Home Version 1809



In the past, it was there, and also in the past, I was able to mount .iso files by right clicking, and selecting "mount". The option to mount is still there;





But gives me this error;





(this is part of my secondary issue being taken care of in another thread (hopefully)) so please don't move this thread to virtualization.

What I want:

I want the .iso extension back in my list of extensions in my settings --> default apps--> choose default apps by file type window.


Things I have tried;

• 1) Going to Settings - Indexing Options
  2) Advanced button
  3) File Types tab
  4) Add New Extension to List box, type in extension, (without a period) in this case "iso"
  5) Click OK and Close
• Right clicking any .iso file, and selecting "open with", then selecting "choose another app", and then selecting "Windows Explorer".
• Right clicking any .iso file, selecting "Properties", then selecting the "Change" button under "opens with" and selecting "Windows Explorer".
• Restoring the default Windows file extension through registry fix detailed here with OPTION TWO and selecting the .iso reg file, adding it to my registry, and restarting my pc.
• I created a "fake" extension named .isotest. It successfully appeared in the settings menu(see picture above)
• Ran "DISM /Online /Cleanup-Image /RestoreHealth" in elevated cmd prompt and then "sfc /scannow" in an elevated command prompt. No issues were found.

In the registry, it shows that iso files are opened with Windows.IsoFile. Looking under the reg key, I cannot tell if anything is incorrect. Below are the reg keys associated with Windows.IsoFile and the .iso key in Computer\HKEY_CLASSES_ROOT\















I'm not sure what else to do aside from formatting my pc which I really don't want to do for this issue. Help is greatly appreciated. Please read the whole post before suggesting things please.

Thanks.