加了多种壳的识别系统！ The file userdb.txt is used to store the external signatures. ;External signatures can be modified by the user as and when he requires. ;The signatures are in the format [Name of the Packer v1.0] signature = 50 E8 ?? ?? ?? ?? 58 25 ?? F0 FF FF 8B C8 83 C1 60 51 83 C0 40 83 EA 06 5