In CS5 and 5.5, they were in the install. Do you have Encore CS5.1 (which is Encore for CS5.5) installed?
If so, look in Encore at Preferences and see where it says your library should be. It should point to the program files (x86).
In CS5 and 5.5, they were in the install. Do you have Encore CS5.1 (which is Encore for CS5.5) installed?
If so, look in Encore at Preferences and see where it says your library should be. It should point to the program files (x86).