File list (Check if you may need any files):
project\.lso
.......\Add.v
.......\caculate_result.v
.......\caculate_result.v.bak
.......\decode_4_16.v
.......\device_usage_statistics.html
.......\display_12.v
.......\display_8.v
.......\mod_5.v
.......\mux_16_1.v
.......\pbdebounce.v
.......\project.ipf
.......\project.ipf_ISE_Backup
.......\project.ise
.......\project.ise_ISE_Backup
.......\project.ntrc_log
.......\regfile.v
.......\regfile.v.bak
.......\register7.v
.......\Sub.v
.......\timer_1ms.v
.......\timing.twr
.......\top.bgn
.......\top.bit
.......\top.bld
.......\top.cmd_log
.......\top.drc
.......\top.lso
.......\top.ncd
.......\top.ngc
.......\top.ngd
.......\top.ngr
.......\top.pad
.......\top.par
.......\top.pcf
.......\top.prj
.......\top.stx
.......\top.syr
.......\top.twr
.......\top.twx
.......\top.ucf
.......\top.unroutes
.......\top.ut
.......\top.v
.......\top.v.bak
.......\top.xpi
.......\top.xst
.......\top_guide.ncd
.......\top_map.map
.......\top_map.mrp
.......\top_map.ncd
.......\top_map.ngm
.......\top_pad.csv
.......\top_pad.txt
.......\top_prev_built.ngd
.......\top_summary.html
.......\top_summary.xml
.......\top_usage.xml
.......\Xor.v
.......\xst\dump.xst\top.prj\ntrc.scr
.......\...\work\hdllib.ref
.......\...\....\vlg01\display__8.bin
.......\...\....\....4\register7.bin
.......\...\....\...14\caculate__result.bin
.......\...\....\.....\display__12.bin
.......\...\....\...24\mod__5.bin
.......\...\....\....9\adder__8bits.bin
.......\...\....\...31\_add.bin
.......\...\....\....4\add__1bit.bin
.......\...\....\....5\_xor.bin
.......\...\....\....9\timer__1ms.bin
.......\...\....\...46\_sub.bin
.......\...\....\....B\sub__8bits.bin
.......\...\....\....C\mux__16__1.bin
.......\...\....\...53\adder__1bit.bin
.......\...\....\....5\decode__4__16.bin
.......\...\....\...6F\pbdebounce.bin
.......\...\....\.....\top.bin
.......\...\....\...72\regfile.bin
.......\_impact.cmd
.......\_impact.log
.......\.ngo\netlist.lst
.......\.xmsgs\bitgen.xmsgs
.......\......\map.xmsgs
.......\......\ngdbuild.xmsgs
.......\......\par.xmsgs
.......\......\trce.xmsgs
.......\......\xst.xmsgs
.......\xst\dump.xst\top.prj\ngx\notopt
.......\...\........\.......\...\opt
.......\...\........\.......\ngx
.......\...\........\top.prj
.......\...\work\vlg01
.......\...\....\vlg04
.......\...\....\vlg14
.......\...\....\vlg24
.......\...\....\vlg29
.......\...\....\vlg31
.......\...\....\vlg34
.......\...\....\vlg35