This is not possible to open NSF file without Lotus Notes, but I suggest you to get SysInspire NSF to PST converter software. This tool has a multiple file format for conversion it can convert NSF file into multiple format such as NSF to PST, EML, EMLX, Office 365, Yahoo Mail, Gmail, Zimbra-tgz, etc. It has 15+ file format for conversion. It has a demo version that can allow users to convert 25 items from each folders. It has a technical support all users can get help by email or live chat. It convert NSF file into PST. it export mailbox items such as cc, bcc, from, to, do, subject.etc. It support all versions of Windows and Lotus Notes.