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"Always use this program to ouvrir these fichiers" is grayed out. Why?

ayi

I inadvertently set the Éditeur du registre to be the default editor for *.txt files. Now when I allez dans change the default, "Always use this program to open these files" is grayed out. This is the case whether I clic droit on the file et choisissez "Open with...", or start with the "Set Default Programs" control panel.

Why? Comment puis-je fix this?

ayi

I came across this problem again, but in this case the file association fixer tool suggested by @Moab didn't work because it only handles a handful of common extensions, and the extension I was having trouble with (.ahk) isn't included.

I did some more digging and found a general solution using regedit; this did the trick for me.

Open regedit
Allez dans HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts
Find your extension
Delete the UserChoice key