You can create your own setup with InnoSetup. Thats for Pegasus Mail. Change it for your needs. REGEDIT4 [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail] @="Pegasus Mail" [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Protocols] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Protocols\mailto] @="URL:MailTo Protocol" "EditFlags"=hex:02,00,00,00 "URL Protocol"="" [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Protocols\mailto\DefaultIcon] @="C:\\Programs\\PMAIL4\\WSENDTO.EXE,0" [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Protocols\mailto\shell] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Protocols\mailto\shell\open] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Protocols\mailto\shell\open\command] @="C:\\Programs\\PMAIL4\\WSENDTO.EXE %1" [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Shell] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Shell\open] [HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Pegasus Mail\Shell\open\command] @="C:\\Programs\\PMAIL4\\WINPM-32.EXE" Have fun, xneogen