IconPackager 4.20 & Vista X64 bug
InterentStartMenu
http://msdn.microsoft.com/en-us/library/dd203067%28VS.85%29.aspx
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Stardock Forums
Is it by design that IP v4.2 screws the start menu internet shortcut when you appy a package & have Firefox set as default web browser?
There is no "HKLM\Software\Clients\StartMenuInternet\Firefox.exe" subtree under Vista. Applying a package adds a skeleton subtree missing vital data which breaks the start menu internet shortcut until you remove the offending subtree with regedit.
This subtree is populated correctly under XP32 SP.