You're here because you have a file that has a file extension ending in .chk. Files with the file extension .chk can only be launched by certain applications. It's possible that .chk files are data files rather than documents or media, which means they're not meant to be viewed at all.

File fragments created by the associated Microsoft Windows OS are also called saved file fragments and are generally classified as data files. These files are affixed with the .chk extension and contain data associated to a file that has been deleted or stored in a different location in the disk. The ScanDisk application, also called CHKDISK, is an applet built into most Microsoft Windows OS versions. This applet is used to find and delete unused files created by the system and can locate CHK files to permanently delete them since the files that correspond to the content of those CHK files have already been deleted or moved by users to another directory. Files in the CHK format are usually placed in a system directory labeled "Found", and these CHK files are also created after using the ScanDisk applet to scan the data storage devices connected to the computer. There are third party applications developed to open and view the content of these CHK files, and the CHK-Mate software is an example of a program that can be installed in a Microsoft Windows system to implement support for this purpose. The FileCHK program and the UnCHK software were on the other hand developed to provide users with functionalities for recovering or restoring the data contained in a CHK file.

Launch a .chk file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .chk file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .chk files aren't yet associated with it. In this case, when you try to open a .chk file, you can tell Windows which application is the correct one for that file. From then on, opening a  .chk file will open the correct application. Click here to fix .chk file association errors

Be careful not to rename the extension on .chk files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .chk. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.