You can use FonePaw Data Recovery, a professional data recovery tool to recover lost or corrupted photos, videos, or files from your memory card or hard drive. Using data recovery software is the most convenient way to retrieve lost data from CHK files. Recover CHK Files with FonePaw Data Recovery You need to tick off 'hidden folder' in 'View' on the top of File Explorer to show this folder. To sum up, chk files are just corrupted data produced by check disk tool while Found.000 folder is created by Windows to contain them. Then the Windows built-in chkdsk (check disk) tool will automatically run and create Found.000 folder and transfer all chk files (fragmented files) into this folder. Chk files are fragmented files, which are produced when the process of writing files into a volume is stopped in the middle or when files are not saved before the sudden shutdown of your PC.