As many BizTalk developers, I often need to deal with the Gac importing and exporting dlls to be sure that BizTalk will be able t find them.
For newbies, the trick is that Microsft added a tricky Windows explorer shell extension when you acess the Gac Folder (c:Windowsassembly).
Usually I use gacutil command tool to manage the gac. But today I googled and found many different ways to export DLL from it : my favorite is when Windows gets fooled with a subst command !
The links :