private string GetPassword(string file)
        {                       // 未加密的文件0x42开始至0x61之前的每间隔一字节的数值
            byte[] baseByte = { 0xbe, 0xec, 0x65, 0x9c, 0xfe, 0x28, 0x2b, 0x8a, 0x6c, 0x7b, 0xcd, 0xdf, 0x4f, 0x13, 0xf7, 0xb1, };
            byte flagByte = 0x0c; // 标志 0x62 处的数值
            string password = "";
            try
            {
                FileStream fs = File.OpenRead(file);
                fs.Seek(0x14, SeekOrigin.Begin);
                byte ver = (byte)fs.ReadByte();     // 取得版本, 1为Access2000, 0为Access97
                fs.Seek(0x42, SeekOrigin.Begin);
                byte[] bs = new byte[33];
                if (fs.Read(bs, 0, 33) != 33) return "";
                byte flag = (byte)(bs[32] ^ flagByte);
                for (int i = 0; i < 16; i++)
                {
                    byte b = (byte)(baseByte[i] ^ bs[i * 2]);
                    if (i % 2 == 0 && ver == 1) b ^= flag;  //Access 2000
                    if (b > 0) password += (char)b;
                }
            }
            catch { }
            return password;
        }