BK2 file icon

BK2 File Extension

Windows Indexing Service Data Format
  • Developer
  • Category
  • Popularity
    3.8 (8 votes)

What is BK2 file?

BK2 (Windows Indexing Service Data) is a Windows system file. The file is created as a result of indexing system resources to in order to improve searching performance. Data in BK2 files is save in machine-readable format. Typically BK2 files are saved in "C:System Volume Informationcatalog.wci" folder under the name propstor.BK2. In the same folder many other files can be found, such as BK2, PS1, PS2, FID, 000, or HSH.

Windows indexing service

Windows uses indexing to improve file and program search process. When indexing is active, each file modification information is saved in dedicated memory (for example in BK2 files). This allows the search engine to sort results based on created list.

Programs which support BK2 file extension

The following listing features BK2-compatible programs. BK2 files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

Programs that support BK2 file

Updated: 11/01/2023

How to open file with BK2 extension?

Problems with accessing BK2 may be due to various reasons. On the bright side, the most encountered issues pertaining to Windows Indexing Service Data Format files aren’t complex. In most cases they can be addressed swiftly and effectively without assistance from a specialist. We have prepared a listing of which will help you resolve your problems with BK2 files.

Step 1. Get the Microsoft Windows

Install software to open BK2 file The most common reason for such problems is the lack of proper applications that supports BK2 files installed on the system. To address this issue, go to the Microsoft Windows developer website, download the tool, and install it. It is that easy Above you will find a complete listing of programs that support BK2 files, classified according to system platforms for which they are available. One of the most risk-free method of downloading software is using links provided by official distributors. Visit Microsoft Windows website and download the installer.

Step 2. Verify the you have the latest version of Microsoft Windows

Update software that support file extension BK2If you already have Microsoft Windows installed on your systems and BK2 files are still not opened properly, check if you have the latest version of the software. It may also happen that software creators by updating their applications add compatibility with other, newer file formats. If you have an older version of Microsoft Windows installed, it may not support BK2 format. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Microsoft Windows.

Step 3. Assign Microsoft Windows to BK2 files

After installing Microsoft Windows (the most recent version) make sure that it is set as the default application to open BK2 files. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.

Associate software with BK2 file on Windows

Change the default application in Windows

  • Right-click the BK2 file and choose Open with option
  • Select Choose another app → More apps
  • Finally select Look for another app on this PC, point to the folder where Microsoft Windows is installed, check the Always use this app to open BK2 files box and conform your selection by clicking OK button
Associate software with BK2 file on Mac

Change the default application in Mac OS

  • By clicking right mouse button on the selected BK2 file open the file menu and choose Information
  • Proceed to the Open with section. If its closed, click the title to access available options
  • Select Microsoft Windows and click Change for all...
  • If you followed the previous steps a message should appear: This change will be applied to all files with BK2 extension. Next, click the Continue button to finalize the process.

Step 4. Check the BK2 for errors

Should the problem still occur after following steps 1-3, check if the BK2 file is valid. Being unable to access the file can be related to various issues.

Check BK2 file for viruses
1. The BK2 may be infected with malware – make sure to scan it with an antivirus tool.

If the BK2 is indeed infected, it is possible that the malware is blocking it from opening. Scan the BK2 file as well as your computer for malware or viruses. If the BK2 file is indeed infected follow the instructions below.

2. Ensure the file with BK2 extension is complete and error-free

Did you receive the BK2 file in question from a different person? Ask him/her to send it one more time. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. It could happen the the download process of file with BK2 extension was interrupted and the file data is defective. Download the file again from the same source.

3. Ensure that you have appropriate access rights

There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Switch to an account that has required privileges and try opening the Windows Indexing Service Data Format file again.

4. Verify that your device fulfills the requirements to be able to open Microsoft Windows

The operating systems may note enough free resources to run the application that support BK2 files. Close all running programs and try opening the BK2 file.

5. Check if you have the latest updates to the operating system and drivers

Latest versions of programs and drivers may help you solve problems with Windows Indexing Service Data Format files and ensure security of your device and operating system. It is possible that one of the available system or driver updates may solve the problems with BK2 files affecting older versions of given software.

Do you want to help?

If you have additional information about the BK2 file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on BK2 file.

Top File Extensions
Show more
File Extension of the day
tts icon


ToolBook Translation System Format

TTS files are associated with ToolBook software. What type of data TTS files store? Files with TTS extensions store configuration data for ToolBoo...