Typically, it is safe to delete CHK files after the scan is complete however, to be sure you may want to check on exactly what information the files contain. When errors are found, the ScanDisk or ChkDsk utility will store the file fragments as CHK extensions which are then stored in the Found folder after the disk check program has completed the scan. The files are created from this utility program and are fragmented files cleaned from the hard disk using this program. CHK file extension are files that are typically associated with Windows Chkdsk/Scandisk command utility included in the Windows operating system. I didn't even reboot the machine between when the file last worked and when I noticed it no longer did work.Files which contain the. The document has some personal details in it (when it normally works) is anyone able to take a quick look and see if they can fix or salvage some of it, somehow (without me having to post it publicly on here)? I need to find a more reliable method of backing up, as clearly this is an issue. Anyway, long story short, my most recent copy of this file is well over a year old. Thought that was strange, as I had saved it yesterday afternoon. I update this file pretty much on a daily basis, and when I went to open the file today (it worked fine yesterday), I noticed that the most recent modification/save date was nearly a month ago (March 11th). Somehow, the backup that I had saved of this file is also missing, along with a couple other downloads I had made over the last week or so (pictures, a few mp3's, etc).

Sorry for bumping an old thread.something similar happened to the same file I had troubles with last summer.

Opening chk files