| Licence Or Encrypted Security Format | |
| N/A | |
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KEY is a file extension commonly used by various license KEY management application for license KEY files.
KEY files store license KEY registration information or safety codes for various programs and applications. Such data is typically in the form of encrypted KEY string required to register given program or application.
| .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 |
