File list (Check if you may need any files):
c51
c51\bdhy
c51\bdhy.c
c51\bdhy.hex
c51\bdhy.lnp
c51\bdhy.LST
c51\bdhy.M51
c51\bdhy.OBJ
c51\bdhy.plg
c51\bdhy.uvgui.Administrator
c51\bdhy.uvgui_Administrator.bak
c51\bdhy.uvopt
c51\bdhy.uvproj
c51\hongwai
c51\hongwai.c
c51\hongwai.c.bak
c51\hongwai.hex
c51\hongwai.lnp
c51\hongwai.LST
c51\hongwai.M51
c51\hongwai.OBJ
c51\hongwai.plg
c51\hongwai.uvgui.Administrator
c51\hongwai.uvgui_Administrator.bak
c51\hongwai.uvopt
c51\hongwai.uvproj
c51\led
c51\led.c
c51\led.hex
c51\led.lnp
c51\led.LST
c51\led.M51
c51\led.OBJ
c51\led.plg
c51\led.uvgui.Administrator
c51\led.uvgui_Administrator.bak
c51\led.uvopt
c51\led.uvproj
c51\led.zip
c51\rs232.c
c51\rs232.LST
c51\rs232.OBJ
c51\rs232hy
c51\rs232hy.hex
c51\rs232hy.lnp
c51\rs232hy.M51
c51\rs232hy.plg
c51\rs232hy.uvgui.Administrator
c51\rs232hy.uvgui_Administrator.bak
c51\rs232hy.uvopt
c51\rs232hy.uvproj
c51\STARTUP.A51
c51\STARTUP.LST
c51\STARTUP.OBJ
c51\test
c51\test.c
c51\test.hex
c51\test.lnp
c51\test.LST
c51\test.M51
c51\test.OBJ
c51\test.plg
c51\test.uvgui.Administrator
c51\test.uvgui_Administrator.bak
c51\test.uvopt
c51\test.uvproj
c51\test1
c51\test1.c
c51\test1.hex
c51\test1.lnp
c51\test1.LST
c51\test1.M51
c51\test1.OBJ
c51\test1.plg
c51\test1.uvgui.Administrator
c51\test1.uvgui_Administrator.bak
c51\test1.uvopt
c51\test1.uvproj