So I’ve recently got a new machine that came pre installed with Windows Vista. And now I’ve got the fun task of trying to make everything work again with my plugin 
There are a number of places where I’ve found some good info on this, which I will enumerate here for your and my benefit.
http://www.codeproject.com/KB/vista-security/PMSurvivalGuide.aspx - A Developer’s Survival Guide to IE Protected Mode
http://technet.microsoft.com/en-us/magazine/cc138019.aspx - Inside Windows Vista User Account Control
http://msdn.microsoft.com/en-us/library/bb250462.aspx - Understanding and Working in Protected Mode Internet Explorer
http://blogs.msdn.com/ie/archive/2006/02/09/528963.aspx - Protected Mode in Vista IE7
A couple of key things if you’re relying on the compatibility shims: (described in a little more detail in the 4th link)
Registry Accesses (to HKCU software) are moved to
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\InternetRegistry\REGISTRY\USER\[User security identifier - SID]\Software\[my key]
File accesses (to acceptable locations) are moved to
%userprofile%\AppData\Local\Microsoft\Windows\Temporary Internet Files\Virtualized\{system drive letter}\Users\{username}
I hope to update more this as I dive further into updating my plugin and making it work in both XP and Vista.
Tags: Internet Explorer Plugin, vista
