File list (Check if you may need any files):
Keil
....\C51
....\...\ASM
....\...\...\AT898252.INC
....\...\...\AT89S53.INC
....\...\...\AT8xc5103.inc
....\...\...\C8051F000.INC
....\...\...\C8051F200.INC
....\...\...\REG152.INC
....\...\...\REG320.INC
....\...\...\REG410.INC
....\...\...\REG451.INC
....\...\...\REG452.INC
....\...\...\REG453.INC
....\...\...\REG504.INC
....\...\...\REG505C.INC
....\...\...\REG505L.INC
....\...\...\REG509.INC
....\...\...\REG51.INC
....\...\...\REG515.INC
....\...\...\REG515A.INC
....\...\...\REG515C.INC
....\...\...\REG517.INC
....\...\...\REG517A.INC
....\...\...\REG51F.INC
....\...\...\REG51G.INC
....\...\...\REG51GB.INC
....\...\...\REG52.INC
....\...\...\REG520.INC
....\...\...\REG528.INC
....\...\...\REG530.INC
....\...\...\REG552.INC
....\...\...\REG592.INC
....\...\...\REG652.INC
....\...\...\REG750.INC
....\...\...\REG781.INC
....\...\...\t89c51ac2.inc
....\...\...\t89c51cc02.inc
....\...\...\TE5_CSOC.inc
....\...\...\TEMPLATE.A51
....\...\BIN
....\...\...\A51.EXE
....\...\...\Ax51.exe
....\...\...\BL51.EXE
....\...\...\c51.dll
....\...\...\c51.exe
....\...\...\CO-KC51.LNT
....\...\...\CX51.EXE
....\...\...\d500.chm
....\...\...\D500.DLL
....\...\...\dlpc.chm
....\...\...\DLPC.dll
....\...\...\dp51.chm
....\...\...\DP51.DLL
....\...\...\ISD51.dll
....\...\...\LIB51.EXE
....\...\...\LIBX51.EXE
....\...\...\lx51.exe
....\...\...\Mon51.dll
....\...\...\OC51.EXE
....\...\...\OH51.EXE
....\...\...\Ohx51.exe
....\...\...\RTX51.dll
....\...\...\RTXTINY.DLL
....\...\...\s51mx.dll
....\...\...\S8051.DLL
....\...\...\T500.dll
....\...\...\te5_uv2.dll
....\...\...\TLPC.dll
....\...\...\TP51.dll
....\...\EXAMPLES
....\...\........\ADI 824B2
....\...\........\.........\ABSTRACT.TXT
....\...\........\.........\ADI.Opt
....\...\........\.........\ADI.Uv2
....\...\........\.........\ADI_B2.C
....\...\........\.........\START_AD.A51
....\...\........\.........\XBANKING.A51
....\...\........\ASM
....\...\........\...\ABSTRACT.TXT
....\...\........\...\ASAMPLE.BAT
....\...\........\...\ASAMPLE.Opt
....\...\........\...\ASAMPLE.Uv2
....\...\........\...\ASAMPLE1.A51
....\...\........\...\ASAMPLE2.A51
....\...\........\...\ASAMPLE3.A51
....\...\........\...\AXSAMPLE.BAT
....\...\........\BADCODE
....\...\........\.......\ABSTRACT.TXT
....\...\........\.......\BADCODE.C
....\...\........\.......\BADCODE.Opt
....\...\........\.......\BADCODE.Uv2
....\...\........\Bank_EX1
....\...\........\........\ABSTRACT.TXT
....\...\........\........\BANK_EX1.Opt
....\...\........\........\BANK_EX1.Uv2
....\...\........\........\C_BANK0.C
....\...\........\........\C_BANK1.C
....\...\........\........\C_BANK2.C
....\...\........\........\C_ROOT.C