The "Extras" directory contains the following files:

!!ReadMe       This file
!TemplHlp      Interactive help data, to be used by !StrongHelp. To use
               the help files, run !StrongHelp first, then double-click
               on the !TemplHlp icon
SaveWimpSpr    Small Basic program to save the sprites in the Wimp
               sprite area to a file; sprites from the ROM and RAM
               part are saved separately
Source         The full source code. (!RunImage has gone through a
               cruncher, to make it smaller and faster)
Sprites3D      Sprites file to replace the standard sprites file
               if you want to use TemplEd with windows in 3D-look
Templs3D       Templates file for the same purpose. To get 3D-windows,
               rename the files "Sprites" and "Templates" in the
               TemplEd application directory, and replace them with
               copies of "Sprites3D" and "Templs3D" (RiscOS 3.10 only)
Use2D, Use3D   A couple of small Obey files for easy switching between
               standard and 3D templates