File list (Check if you may need any files):
03.CH452_Key\C\CH452CMD.H
............\.\CH452W2.C
............\.\CH452W3.C
............\.\CH452W4.C
............\.\EXAM.C
............\.\PIN.H
............\CH452CMD.H
............\CH452Key
............\CH452Key.hex
............\CH452Key.lnp
............\CH452Key.M51
............\CH452Key.opt.bak
............\CH452Key.plg
............\CH452Key.Uv2.bak
............\CH452Key.uvopt
............\CH452Key.uvproj
............\CH452Key_Opt.Bak
............\CH452Key_Uv2.Bak
............\CH452Key_uvopt.bak
............\CH452Key_uvproj.bak
............\CH452W2.C
............\CH452W2.LST
............\CH452W2.OBJ
............\main.c
............\main.LST
............\main.OBJ
............\MCS51ASM\CH452W2.ASM
............\........\CH452W3.ASM
............\........\CH452W4.ASM
............\PIN.H
............\C
............\MCS51ASM
03.CH452_Key