david141,
Код:

WriteRegStr HKLM "SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace\{EC8030F7-C20A-464F-9B0E-13A3A9E97384}" "" "Firefox"
WriteRegStr HKCR "CLSID\{EC8030F7-C20A-464F-9B0E-13A3A9E97384}\DefaultIcon" "" '"$PROGRAMFILES\Firefox\Firefox.exe",0'