File extension NK2
| File type | Microsoft Outlook Contacts AutoComplete Format |
| Developer | Microsoft |
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What is a NK2 file?
NK2 is an extension characteristic of the popular Microsoft e-mail client, Outlook. NK2 file collects data used in the autocomplete content written by the user manually (e.g. e-mail addresses or popular phrases). Such a file also contains a defined nickname associated with the program's user profile and his e-mail address.
Until 2002, files fulfilling this role had the NICK extension. NK2 files are usually hidden in the system.
Program(s) that can open the .NK2 file
Windows
How to open NK2 files
If you cannot open the NK2 file on your computer - there may be several reasons. The first and most important reason (the most common) is the lack of a suitable software that supports NK2 among those that are installed on your device.
A very simple way to solve this problem is to find and download the appropriate application. The first part of the task has already been done – the software supporting the NK2 file can be found in the table. Now just download and install the appropriate application.
Possible problems with the NK2 format files
The inability to open and operate the NK2 file does not necessarily mean that you do not have an appropriate software installed on your computer. There may be other problems that also block our ability to operate the Microsoft Outlook Contacts AutoComplete Format file. Below is a list of possible problems.
- Corruption of a NK2 file which is being opened
- Incorrect links to the NK2 file in registry entries.
- Accidental deletion of the description of the NK2 from the Windows registry
- Incomplete installation of an application that supports the NK2 format
- The NK2 file which is being opened is infected with an undesirable malware.
- The computer does not have enough hardware resources to cope with the opening of the NK2 file.
- Drivers of equipment used by the computer to open a NK2 file are out of date.
If you are sure that all of these reasons do not exist in your case (or have already been eliminated), the NK2 file should operate with your programs without any problem. If the problem with the NK2 file has not been solved, it may be due to the fact that in this case there is also another rare problem with the NK2 file. In this case, the only you can do is to ask for assistance of a professional staff.
Updated 02/10/2022
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How to associate the file with an installed software?
If you want to associate a file with a new program (e.g. my-file.NK2) you have two ways to do it. The first and the easiest one is to right-click on the selected NK2 file. From the drop-down menu select "Choose default program", then click "Browse" and find the desired program. The whole operation must be confirmed by clicking OK. The second and more difficult to do is associate the NK2 file extension to the corresponding software in the Windows Registry.
Is there one way to open unknown files?
Many files contain only simple text data. It is possible that while opening unknown files (e.g. NK2) with a simple text editor like Windows Notepad will allow us to see some of the data encoded in the file. This method allows you to preview the contents of many files, but probably not in such a structure as a program dedicated to support them.