In the sendtox inf originally it is: HKLM,Software\Microsoft\Windows\CurrentVersion\RunOnce\Setup,%ISTX%,,"RUNDLL32.EXE %11%\%SubDir%\SENDTOX.DLL,Install %11%\%SubDir%\SENDTOX.INF" the %ISTX% bit opens a window which you have to manually close (no good for unattended). I managed to get this working at some point, but now icons are not installed in sendto folder. I changed the AddReg bit to the following: "RUNDLL32.EXE %11%\%SubDir%\SENDTOX.DLL,Install %11%\%SubDir%\SENDTOX.INF" Please could someone post the full syntax for sendtox exactly as it should be? I assume what has been given so far is to go in batch file rather than "inf file". Thanks.