Thanks Matt,
I would believe it is created by MS, it is a default gadget in the "Add Gadgets" section of the sidebar.
Update: I have been flipping through the registry, and finally found the registry key: HKEY_CLASSES_ROOT\mailto\shell\open\command\default
I have modified the filepath to winmail.exe, but now it starts winmail, but does not open the "Compose" window. It just opens the winmail.exe process, but not the app itself. Will continue to fidget around with it.
Any help would be appreciated.
Thanks,
Heeter