New
#11
I think you are asking about "accelerator keys" (or "access keys" in Settings). If you have the underline turned on when you open the context menu with the mouse (search for underline in Settings) , or open the context menu with the "menu key" (usually next to the right control key), or Shift -F10 for the extended context menu, you can see any such keys. If there are items with the same access key, then pressing that key cycles between the options, and you press Enter when you have arrived at the correct one . If there is only one, then that action happens straight away.
There are basically two types of context menu that you see. One triggers a shell extension, which does whatever its author programmed it to do, and probably won't allow you to do anything to modify it. (Found in HKCR under a ShellEx key). The other which has simple rules comes under a Shell key. It's quite likely that the text of the menu item can be found by searching for the text in the registry. If you can find the text under a Shell key, you can change it. The access key has an & character immediately before it. Clearly if you can choose a character that isn't being used in the context menu for the filetype that you are interested in, then you should achieve your goal.
As always, unless you need to make this change for all users of the computer, you should make the change under HKCU\Software\Classes, rather than HKCR, or HKLM\Software\Classes. You may need to add keys under HKCU\Software\Classes, but you won't require any permissions to do this.
Useful reference: https://learn.microsoft.com/en-us/wi...-menu-handlers