Information about the .nk2 (nk2) file type

Below is all the information we have available on file about the .nk2 (nk2) file type.

Microsoft Outlook NicKname data file. Also known as an autocomplete name list. A binary file used by Microsoft Outlook that contains auto-complete information, this is the information used by Outlook that lets it suggest the full email address when only part of the email address has been entered.

The .nk2 file is a hidden file. Its location varies according to the version of Windows:

Windows Version Location
Windows NT C:\WinNT\Profiles\<username>\
Windows 2000 C:\Documents and Settings\<Username>\Application Data\Microsoft\Outlook
Vista C\Users\<username>\AppData\Roaming\Microsoft\Outlook

The following links provide further information related to the .nk2 file extension:

Where this is available we would like to include file format information on .nk2 files, as well as information on how to view or open files of type .nk2. If you know of any information which we have missed then please let us know.