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I wanted to set Photoshop as my default image viewer (need a workaround because Windows doesn't recognize it), so I have to edit my Registry. In the tutorial on the official Adobe website, they say to navigate to the location:

HKEY_CURRENT_USER\Software\Classes\Applications\Photoshop.exe\shell\open\command

But the only location with Application I found was this:

HKEY_CURRENT_USER\SOFTWARE\Classes\AppXak1hygz1tpjjnxhr1pwtcgnkpr24r5e7\Application

Doesn't this path look suspicious?

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Do not assume that everything with a bizarre name is a virus! For example, the items in \Windows\WinSxS are all named with non-English character sequences, but they're critical to your system's health.

Subkeys under HKCU\Software\Classes that start with AppX belong to Windows Universal (or Metro, if you like) apps, the kind you get from the Windows Store. I have them on my Windows 8 machine, and they appear in a fresh install of Windows 10. You can see which app is which by opening the Application subkey and looking at the ApplicationName entry.

The AppX name fragment also decorates other components related to those apps, like the Get-AppxPackage PowerShell command.

Don't worry, the presence of such Registry entries does not mean you have a virus.


Also, you might find the Registry settings you're looking for under HKEY_CLASSES_ROOT\Applications. Finally, there are other Registry ways to change the default programs that don't use that specific path.

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  • Upvoted for the first/bold sentence :P
    – Tom Yan
    Mar 31, 2016 at 22:39
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    Also, one should use the default programs control panel, or ftype and assoc commands, in preference to manual registry editing. assoc assigns an extension to a named file type and ftype assigns a named file type to a default program.
    – Bob
    Mar 31, 2016 at 23:19
  • Thanks Ben. Yea you are right. But today somehow TWINUI appeared somehow (windows didnt updated something and I haven't installed something) in the "open as" tab and changed it self as a default viewer for almost everything. In addition to that I have only noticed this change because I got a weird class error while trying to open an image file. And that was too suspicious, I thought. @Bob As I said windows doesnt regonize it so I coulnt choose it. After googling it I have found the adobe instructions.+1 Good to here about the commands didnt knew them.
    – Sens4
    Apr 1, 2016 at 0:57

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