REGEDIT4

; Button text
[HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"ButtonText"="Windows Live Messenger"

; {1FBA04EE-3024-11D2-8F1F-0000F87ABD16} MUST BE THIS GUID
[HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"CLSID"="{1FBA04EE-3024-11D2-8F1F-0000F87ABD16}"

; Show icon if IE toolbar is reset
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"Default Visible"="Yes"

; Your app path and name
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"Exec"="C:\\Program Files\\Windows Live\\Messenger\\MSNMSGR.EXE"

; Colored icon
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"HotIcon"="C:\\Program Files\\Windows Live\\Messenger\\MSNMSGR.EXE,1"

; Default icon
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"Icon"="C:\\Program Files\\Windows Live\\Messenger\\MSNMSGR.EXE,1"

; Statusbar text for your app
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"MenuStatusBar"="Windows Live Messenger"

; Tools Menu text for your APP
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Extensions\{FB5F1910-F110-11d2-BB9E-00C04F795683}]
"MenuText"="Windows Live Messenger"