Phonebook backup error?

Before writing flash in phone i made backup:

Start Backup …
Prepare environment … ok
Reading contacts data … ok
Reading SMS data … ok
Saving backup file to "D:\BST\samsung_GT-I9100__2016-03-03_11.10.27.bkz" … ok
contacts backup: 573
SMS backup: 0
No SMS to backup or error happened
Time used : 1 min 40 s

When load backup file:


Load "D:\BST\samsung_GT-I9100__2016-03-03_11.10.27.bkz" ok
Backup File Info:
brand : samsung
model : GT-I9100
imei :
contacts : 573
sms count : 0
Call Logs :
backup time: 2016-03-03_11.10.27

But when restore proces finished in phone is only 57 contacts. Any way to open contacts.bkp manual or convert to .vcf?