NK2Edit, a lightweight utility that allows you to edit files with a.NK2 extension that were created by Outlook, is small and lightweight. The files are used by Outlook's 'AutoComplete" feature, which helps you complete email addresses and contact details. The NK2Edit utility is a useful tool.
These are the key features
NK2Edit allows you to create a new NK2 File and add the desired email addresses to it. You can either type them manually or copy records from another NK2 source.
NK2Edit allows the extraction of data from corrupted NK2 file files that Outlook cannot read and repair them.
All data in the NK2 files can be exported to a Unicode text file with a structure similar that of Windows'.ini file. It can be opened with a text editor. After making the necessary changes, you can convert it back to an NK2 file for Outlook.
NK2Edit can be used on any Windows computer running Windows 2000 (or later) without the need for any installation or modifications to the Registry.