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Something on my Windows 10 profile seems to be broken. Trying to double-click on an mp3 file yields "Class not registered":

Class not registered

Selecting "Open with/Choose another app" in the context menu yields:

TWINUI is great

Checking the default file associations also reveals that TWINUI is "Recommended for Windows 10":

TWINUI is recommended

Now, I know that I could fix this issue by just choosing Windows Media Player as my default mp3 player, but since I do want to "enjoy all the music I love" (see second screenshot) I'd really like to give TWINUI a chance. Some websites claim that TWINUI is just an app chooser, but surely they must be mistaken since Windows tells me that TWINUI is the bestest media player of all times.

No, seriously: It looks like some default Metro media player app that should be there is missing. How can I restore it? (I did not install anything from the app store, it's a plain Windows 10.0.14393.187.)

Note: Other apps work fine and I don't have permission errors in my event log, so it's not a duplicate of this question.

Community
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Heinzi
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2 Answers2

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The issue has been fixed by upgrading the machine to the current Redstone 2 build (v10.0.14931.1000, now available on the slow insider ring).

Unfortunately, that also means that the reason for this issue might forever remain unknown. It might have been a bug that was fixed, or it might have been a configuration issue fixed as a side-effect of the upgrade.

And another mystery has been solved: The "best music app" is actually called Groove:

enter image description here

Heinzi
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I recently came across this issue as well. The issue is caused by corrupted or invalid registry key/value pairs.

I found a PowerShell script which fixes the bug and I'm now hosting it on Github at https://github.com/WillBixler/TwinUI-Fix.

Will Bixler
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