cannot change file association

Problem is, before my machine even got wind of the kb4462919 update, I did use the windows update diagcab troubleshooter to hide that update, but windows update still found it, and still applied it; perhaps I should've disconnected from the internet entirely, then ran the update, so when it failed and I tried again, windows update would recognize that update as hidden

TL;DR didn't make a macrum reflect backup, stuck till next CU or small update that resolves it (which I really hope its soon); then ill reassign all the file associations then use dism to make a file associations backup in-case something like this happens again

Is it possible to change file associations via Registry Editor?

all file type associations have registry entries, else there wouldn't be a tenforums tutorial entry regarding resetting default file associations for various extensions (iso, png, xml, etc...), so yes, we can. Internal windows settings/3rd party programs help to do most of the syntax work so all you need to do is change a few things, click ok, and voila

the only difficulty is figuring out what entries to make/modify, then resetting your computer and hoping that whatever you change doesn't 86 your computer

BrokenDaily said:

86 your computer

What does "86" stand for?

its another way of saying break, or mess up

BrokenDaily said:

the only difficulty is figuring out what entries to make/modify

Perhaps the experts here know how to do it readily.

Until it is fixed by microsoft, in cmd (here an example with .xml) :

assoc .xml
(outputs "xml=xmlfile")
ftype xmlfile="C:\Windows\System32\anyprogram.exe" "%1"

Or for a non-already existing extension :

assoc .abc=abcxyz
ftype abcxyz="C:\Windows\System32\anyprogram.exe" "%1"

@trogne, please tell me whether the following is correct.

".avi" already exists.
assoc .avi
ftype avifile="C:\Program Files (x86)\The KMPlayer\kmplayer.exe" "%1"

".flv" does not exist.
assoc .flv=flvxyz
ftype flvxyz="C:\Program Files (x86)\The KMPlayer\kmplayer.exe" "%1"

Also, how can I check whether an extension already exists or not?

@Matthew Wai , To check if a file association already exist , for instance for ".flv" in my case :

assoc .flv
output : .flv=VLC.flv

ftype VLC.flv

output : VLC.flv="C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "%1"