Possible Bug - KB4458469 - Unable to set notepad as default programs

Same thing happens with update KB4462919.

Its replicatable, Did the same on my laptop:

Create a new text document, rename the file extension to any random set of letters, open it, select notepad as default, The icon should remain the same blank white icon and you will have to choose a program again when opening it.

Example video:  https://www.youtube.com/watch?v=vu9vzmVKI3s

I can replicate this as well. I didn't think to uninstall the latest KB however, I resinstalled from scratch 1803 and after installing KB4462919, I couldn't change any file association by any method.

For example, via Explorer using the context menu and Open With, with "Always use this app to open .txt files" checked, on any .txt files. 

I opened Task Manager as well, and saw that an instance of OpenWith.exe was still running. The Open With dialog didn't close with any error following it. It closed as if it worked properly, but File Explorer didn't refresh it's display, and the file association had not been changed. After going through the Open With dialog a few times, I went to look in Task Manager again, and saw multiple instances of OpenWith.exe still running, even though all Open With dialogs closed without showing any error.

It seems the KB was released on Oct 9, 2018. 

https://support.microsoft.com/en-ca/help/4462919/windows-10-update-kb4462919

I'll uninstall it, and report back.

Yes, I can confirm, removal of KB4462919 resolves the file association issue entirely.

It is also noteworthy, however, that another PC I have is completely unaffected by this issue, and yet it has KB4462919 installed.

Both Win10 builds were the same 17134.345 (atm, the previously affected PC has the build 17134.112).

For me it was KB4462919

I was having this issue on a newly created profile.  If it was happening on the pre-existing profile, I had not noticed yet.  I did not have KB4458469 installed but per a thread I found on Reddit, I uninstalled KB4462919 and the problem appears to have gone away.

After refreshing my system in the hopes of fixing this bug, with no success, I removed KB4462933 and was able to assign Notepad to my .srt files.

Thank you for the suggestion and resolution.

I found this problem too. I format my disc "C:" with 1809 version becouse of this, and install 1803, but problem uppears again after automatic update, so I delete KB4462919, and all work fine.

So KB4462919 is bugged !!!

https://support.microsoft.com/en-us/help/4462919/windows-10-update-kb4462919

"Microsoft is working on a resolution and estimates a solution will be available in late November 2018."

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