Default Registry Key

I am trying to change the Default Registry Key for telnet, but it isn't working here is what I am typing in:

WriteRegStr HKCR "telnet\shell\open\command" "(Default)" "'\\<servername>\putty.exe' %1"

I have tried this also
WriteRegStr HKCR "telnet\shell\open\command" "'\\<servername>\putty.exe' %1"


any help would be great thanks

Try:


WriteRegStr HKCR "telnet\shell\open\command" "" '\\<servername>\putty.exe' %1"

That worked thanks