We're using the SSH feature over sFTP of WinSCP so we should be safe on the 'Heartbleed' bug.
Ref: https://winscp.net/forum/viewtopic.php?t=13736
Correct. OpenSSL is used with FTP over TLS/SSL only. Majority (about 98%) of WinSCP users use SSH (SFTP/SCP) and plain FTP only and are NOT affected!