| ScanDisk File Fragment | |
| Microsoft | |
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CHK is a system file format associated with Windows (previously MS-DOS) systems for home and business users and servers. CHK files are used by ScanDisk, a disk diagnostics and repair tool.
CHK files store data recovered by ScanDisk during HDD or SSD scan, usually parts of files with errors introduced during data write process. CHK files may be used to recover system’s functionality.
| .aawdef | Ad-Aware Definitions Format |
| .abr | Adobe Photoshop Brush Format |
| .ac$ | AutoCAD Undo Info Format |
| .acc | DR DOS - ViewMax Format |
| .acl | Microsoft Office Automatic Correction List |
| .acs | Microsoft Agent Character Structured Storage Format |
| .ad | After Dark Screen Saver Format |
| .add | Microsoft Dynamics AX Developer Documentation Format |