hi David,
thanks for your replay.
and i dig up that if the file(exe file) singed and the size more than 600M, it will copy file failure using aqFileSystem.CopyFile function in TC.i am not sure this problem if effected by the known issue in Windows XP that the file digital signature will missed in file property if the size of the exe or dll File more than 400M.
and i have tried some other way to copy but it failure remains(eg: command line...).
can you help me to solve this problem?. it is urgent for me now that my automation project can not run in windows xp os.
Thanks very much.