Same OS here and portable EmEditor version with ini instead of registry.
I never have seen such folder in the root.
That folder belongs to your \%AppData\% folder in your profil folder.
For me (as portable) i have an AppData folder in my EmEditor folder.
For an test:
what path do you get if you type \%appdata\% in the address bar of TC?
Because you mentioned D as system drive you should see something like
“D:Documents and SettingsFlintApplication Data”
but in your language
and there should be the subfolder “EmurasoftEmEditorWorkspace”