Windows 10: Unable to Open Any Default Windows Apps

I cannot open any of the default apps of Windows, any time I do this error message pops up.https://imgur.com/N1sPdp3Even things like task manager and command prompt can't be opened.There is only one user on this computer so I'm not sure why I cannot access my own files. I also cannot open apps in administrator mode either.

:)

 

Unable to change default app by protocol or filetype.

Hi, I don't have Acrobat installed. With Sumatra as my default pdf reader, that hyperlink to a pdf docoument opens in.. yes.. Sumatra. Changing to Edge:




the hyperlink opens in... yes.. Edge.

If, as seems the case, Bluebeam is correctly associated with pdf files, I can't say why the hyperlink fails. Your guess about the protocol may be right- I don't know. If you could make any change to that to test that theory, as you suggest, that would help.

If you wish to view the relevant registry key, a convenient way to get there is via free Filetypesman - a rt click option.

 

Mail "Unable to open ..." and duplicate Google Chrome in Default apps

Thanks for suggestion! But for now to change mail app is not an option tho I'll look into it later *Smile

- - - Updated - - -

Want to post a quick update. Today I ran latest CCleaner and fixed all the issues it found with registry then restarted my pc. After restart problem with Mail "Unable to open ..." was gone and still gone after several restarts. All links being successfully opened with default correct Google Chrome. But duplicate Google Chrome still remains in default browser selection list in Default apps. That would be great to surgically remove it but until then I guess I can ignore it. I won't mark this issue as solved coz completely it's not.

 

Unable to change default app by protocol or filetype.

Hi, just considering what is shown in the Open With options, for example:



Here you can see Sumatra is my default reader.





Here you can see Sumatra and Chrome are added to the Open With list, + Edge, a system default.

The choice presented to you for .fdf, .pdfxml, .pdx for example, should depend on whether Bluebeam has correctly registered itself in the appropriate place as capable of handling those extensions.

So, for example, is Bluebeam shown in the Open With list for those extensions?

It is not enough that a program is installed that is potentially capable of handling a file type (e.g. via an Open dialogue) but that it be so registered. That is up to the author to specify.

Application Registration - Windows applications | Microsoft Docs





This opens in Sumatra, my default.

Unfortunately this option in the Control Panel now opens in Settings:



and does not allow you to do what it claims.