.CHK File Extension
File Type 1InterCheck Checksum Database
Database file that contains virus definitions for Sophos Anti-Virus; updated with InterCheck, a service that checks a central virus reporting system; can be modified by changing the InterCheck reporting level and syslog configuration settings.
The InterCheck datbase is named "interchk.chk" by default. It is stored in the /Program Files/Sophos/Sophos Anti-Virus/Config directory on Windows computers.
File Type 2Saved File Fragment
This file is saved in a binary format, which requires a specific program to read its contents.
Windows file fragment cleaned from the hard disk by ScanDisk or CHKDISK; stored in the FOUND folder after a disk scan has been performed; typically can be deleted since the information has been moved somewhere else on the disk.
The program CHK-Mate can be used to examine the contents of a CHK file before it is removed. Also, UnCHK and FileCHK can be used to recover data from CHK files.
File Type 3StarCraft Chunk File
File Type 4Netgear Router Firmware File
File used by Netgear routers when updating the firmware; stores low-level system data that runs the router; can be used for applying router updates using the Netgear Web browser interface, which is often accessed at the local 192.168.1.1 local network address.