error:0308010C:digital envelope routines::unsupported

Earlier i was using winscp 5.6 version that connects using FTPusing a p12 keystore, works perfectly , post upgrading to 6.3 version FTPS doesnt work prompts for a certificate pass phrase and when entered the passphrase of private key it gives error -
error:0308010C:digital envelope routines::unsupported

What nonsense kind of bug is this ????
please fix it.