How to check data file's content in DNS secondary server?

[ShanyiWan]

Zone data file's file type has changed in DNS secondary server, how to check the date file's content?

After upgrade to Bind V9.9.1-P2:
[root at localhost ~]# file /var/named/zzy4.com.dom
/var/named/zzy4.com.dom: data

Before upgrade to Bind V9.9.1-P2:
[root at localhost ~]# file /var/named/zzz4.com.dom
/var/named/zzz4.com.dom: ASCII text

BTW: Bind's version in primary and secondary servers is different

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ShanyiWan