I change an iso file default open program to C:\Windows\explorer.exe , and I can’t change it back. (Try this in virtual machine, not real computer.) How to change it? My OS is Windows 7.

Tried this, but after I change it, the .iso extension disappears from the list.

https://stackoverflow.com/questions/14543602/how-to-change-default-program-open-rar-file-which-select-open-file-by-explorer

I tried the registry, change Windows.IsoFile entry’s shell->open value, and rebooted, but it didn’t work, too

https://www.itechtics.com/set-default-apps/

I deleted the UserChoice subitem of .iso in

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts

, and it works now.

It has a Progid value, with Application\explorer.exe value, which is my previous selection. But I can’t change it. So I deleted it.

After deletion, it automatically get a new value, which is Windows.IsoFile

From this answer: https://stackoverflow.com/a/3924822/16484529