Most of the current software is in shell, which brings great inconvenience to crack the localization. PEiD can detect almost all shells, the number of which has exceeded 53 1 shell types and signatures of PE files, and Peid version 0.94, which can be used to customize the external signature in userdb.txt, adds command line operation support, and is very convenient to use. After analysis, it is the most powerful tool among all kinds of shell detection tools at present. In addition, it can identify what language the EXE file was compiled in.