Following the Creating Shortcut Menu Handlers for adding a non-canonical verb to the shortcut menu:

HKEY_CLASSES_ROOT
   .myp-ms
      (Default) = MyProgram.1
   MyProgram.1
      (Default) = My Program Application
      Shell
         (Default) = doit
         doit
            (Default) = &Do It
            command
               (Default) = c:MyDirMyProgram.exe /d "%1"

I am trying to add one for my custom .base85 file type:

HKEY_CLASSES_ROOT
   .base85
      (Default) = Base85FileType
   Base85FileType
      (Default) = Base-85 Encoded File
      Shell
         (Default) = decode
         decode
            (Default) = &Decode It
            command
               (Default) = notepad.exe "%1"

Which you can see in my .reg dump:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT.base85]
@="Base85FileType"

[HKEY_CLASSES_ROOTBase85FileType]
@="Base-85 Encoded File"

[HKEY_CLASSES_ROOTBase85FileTypeshell]
@="decode"

[HKEY_CLASSES_ROOTBase85FileTypeshelldecode]
@="&Decode It"

[HKEY_CLASSES_ROOTBase85FileTypeshelldecodecommand]
@="notepad.exe "%1""

But no “D͟ecode It” context menu option appears. What am i doing wrong?

Research Effort

Windows does not even recognize the file type description “Base-85 Encoded File”, instead showing a default BASE85 File:

I’ve tried rebooting.

What do you get when you try it?