since 2000
Opening NK2 Files
The NK2 file type is primarily associated with Outlook.
What is an NK2 file
NK2 files mostly belong to Outlook by Microsoft. An NK2 file is an auto-complete list (also called a nickname cache) created by Outlook email client. Outlook uses the contents of an NK2 file to display a list of suggested email addresses when a user starts filling out an email field. It displays possible matches for the email a user is trying to enter. The NK2 auto-complete list format was first introduced in Office 2002. It is updated each time the user sends an email to a new (not previously used) email. Outlook used a NICK file to save its auto-complete list before the introduction of NK2 format.
How to open an NK2 file
You need a suitable software like Outlook from Microsoft to open an NK2 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your NK2 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a NK2 file directly in the browser:. Just drag the file onto this browser window and drop it.
Online NK2 Text Viewer
or drag and drop it here
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NK2 file extension format:
The file format determines how the data is stored in the file. The file format can be deduced from the file extension and the signature. File extension, signature and file format must match; otherwise errors will occur when the file is opened. Knowledge is power - this also applies when dealing with unknown or faulty files. Below you will find our evaluation of the NK2 files:
NK2 is rarely used as a file extension and is mainly used by one program with a specific format. The file formats most commonly found in NK2 files are:
- 95% of all NK2 files are associated with Outlook Nickfile. If you open these files in a text editor, you will see only illegible characters. The files are 18 KB to 1 MB in size, with a median of 390 KB. The file type was developed 10 years ago and is still in use today. The following filename is common: Outlook.NK2. Files like these are about person-related data.
The remaining 5% of all NK2 files are different files with different signatures. If you want to find out what your NK2 file contains, drag and drop it onto this page.
Technical Data for NK2 File Extension
File classification:
Misc
Mime type:
The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.
ProgramID: NICKFile, FileType: Office Data File
an nk2 auto-complete list is a special file format by Microsoft and should only be edited and saved with the appropriate software.
How to solve problems with NK2 files
- Associate the NK2 file extension with the correct application.
- Update your software that should actually open auto-complete lists. Because only the current version supports the latest NK2 file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available Outlook update.
- To make sure that your NK2 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
- Click here to open your .NK2 file online - secure, fast, and no downloads needed.