CHK File Extension
ScanDisk Format Fragment
- File Type chk
- Developer Microsoft
- Popularity
- Application UnCHK
- Category Data Files
What is a CHK file?
Files with the CHK extension are specifically tied to ScanDisk Format Fragment, a Data Files type, and there are 6196 files in this category.
With the creation of the ScanDisk Format Fragment (CHK), Microsoft introduced file format along with 242 programs built for their use.
CHK file support extends to various operating systems, including Windows. You can open a CHK file using one of 4 programs, for example UnCHK, Microsoft ScanDisk and Microsoft Windows.
How to open a CHK file?
The most common reason why a CHK file cannot be opened is the absence of required software. To fix this, select a compatible program from the list. Then visit the official developer website via the provided link, download the program, and install it on your system.
Thanks to their popularity, UnCHK, Microsoft ScanDisk and Microsoft Windows are often the go-to programs for managing CHK files. To install the updated version of UnCHK, simply go to the Eric Phelps site and download the installer compatible with all major platforms.
After setup, the operating system should recognize CHK files and link them with UnCHK.
Set UnCHK to open CHK by default
Change default apps on Mac
- Right-click or use Control + Left-click on the desired CHK file to access the file’s context menu;
- Choose "Open in Application" and click "Other";
- Scroll down to the bottom of the window, and there you will find the "Enable" menu. The default selection is "Recommended Programs";
- Choose "All Programs" within this menu and locate UnCHK. Check the box next to "Always open in app" to set it as the default program.
Change a default app in Windows
- Start the process by right-clicking on your CHK file and selecting "Open With". From there, click "Choose another app" to continue;
- Find the UnCHK application in the pop-up window and select it as your preferred program;
- Select the "Always use this application" check box and click "OK" to save your selection as the default application for opening CHK files.
Easy CHK Troubleshooting
CHK files can sometimes be tricky, but minor software adjustments usually resolve the issues. Refer to the tips below for guidance.
Why does UnCHK stop responding or crash intermittently?
Lack of regular software updates can cause UnCHK to crash. Make sure you have installed the latest updates for Eric Phelps products.
Restarting your computer is often an effective solution to resolve various common problems. Therefore, it is recommended to do so before making any changes to the software configuration.
What are the best practices for repairing a CHK file that has gone bad?
Start a recovery program, open the damaged CHK file and then select the "Repair" menu item to start the repair procedure. Please wait patiently for the recovery process to finish as it will automatically repair the damaged data files.
How can I confirm if my CHK file has been damaged?
Characteristics of corrupted CHK data files can include:
- Editing the archive in Microsoft ScanDisk is hampered by poor overall performance;
- Trying to work with the archive in UnCHK or other programs causes instability or program crashes;
- The file does not open correctly or displays error messages;
- An unexplained increase in the size of the CHK file;
- The file operation is accompanied by the display of error messages;
How to edit a CHK file?
To modify CHK files, you need to install special software that makes it possible to open and edit data files. Online CHK editors are more restricted compared to software designed for ScanDisk Format Fragment.
Best CHK editors 2026
Based on your described criteria, here is a list of available CHK editors.
| CHK Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Microsoft ScanDisk | Microsoft | Windows | 4.8 out of 5 (36 reviews) |