I didn't remove it so it's definitely a software issue of some sort. It's not there. I've used it a lot, and now it's gone.
Most players, including Movies and TV won't play the audio for mkv files. I have 5k player which does so I use it as my default. Well recently the defaults are reset, Movies and TV is my default and the check box to change that is gone. I don't know what else to say lol. It's just gone.
How to Upload and Post Screenshots and Files at Ten Forums - Windows 10 Tutorials
Take Screenshot in Windows 10 - Windows 10 General Tips Tutorials
Use the little icon to the left of the video icon above your post. 'Insert Image'.
Again, do you have any system restore points that may be relevant?
- you will only have some if you enabled system restore in Win 10.
(Do you need guidance on system restore points?)
As to any other steps for fixing this, at present that's guesswork.
Try creating a new user for test purposes, and see if you see the same problem when logged in as that user.
You can try running SFC /SCANNOW from an admin (elevated) command prompt.
[Windows key + X, click command prompt (admin)]
This will check your system files.
For anyone reading this there's a solution for "Always use this app" missing here:
https://www.tenforums.com/general-su...ml#post1907093
Sometimes Windows fails to register the app, even when the option Open with works, in my case XnView.
But most have a "hidden" option to register within Windows associations, you just have to run it as admin.
New tutorial below to help with this now available.
How to Add or Remove Open With 'Always use this app' in Windows 10
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