I am now 99\% sure that there is something wrong with my Windows XP setup.
I have tried the registry change you detail above on 2 seperate Windows XP installations.
The first works fine when I make the change
The problematic one did not have a key of HKEY_CLASSES_ROOT*shell
so I created it and the keys and value underneath this.
After making this change there is no EmEditor at all on my context menu. I tried rebooting my PC without any success.
I think I am just going to have to live with the fact that the context menu doesn’t work with EmEditor on one of my PCs
UPDATE since writing this
I have managed to get a shortcup working from the context menu.
I have done this by using a freeware 3rd party tool called filemenu tools from Lopesoft.
This allowed me to configure what I have on my Windows context menu and I have added an item for EmEditor and it works fine.
My problems appears to be solved by using this.
Thanks for all your help and patience