Because Pcd entity, exception and some action package are shared by Building tools...
drwxr-xr-x - EdkFatBinPkg
drwxr-xr-x - EdkModulePkg
drwxr-xr-x - EdkNt32Pkg
drwxr-xr-x - EdkShellBinPkg
drwxr-xr-x - MdePkg
-rw-r--r-- 27871 ReleaseNotes.txt
drwxr-xr-x - Tools
-rw-r--r-- 1696 build.xml
-rw-r--r-- 8512 edksetup.bat
-rw-r--r-- 4136 edksetup.sh