| Total Commander CRC Format | |
| Ghisler Software | |
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File with a .CRC extension contains a control sum of a divided archive, calculated according to the Cyclic Redundancy Check algorithm. Is it used to verify correctness of unpacked archives into original file.
CRC files are used in the Total Commander software. It enables to explore a file system, to create an archive, FTP connections, and also to compare contents of files.
Windows
| .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 |