openssl error while loading serial number

unable to load number from D:/Program Files/OpenSSL-Win64/bin/demoCA/serial
error while loading serial number
9552:error:0D066096:asn1 encoding routines:a2i_ASN1_INTEGER:short line:.\crypto\asn1\f_int.c:210:

解决：

echo 00 > serial

win10 这儿产生Unicode文件，openssl需要的是ANSI    改一下编码就可以了