Unknown File Extension
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The file extension .UNKNOWN doesn’t mean that a file is a particular UNKNOWN file type but instead it signifies that the file may or may not be of some common type but as the information is not available, the file type is thus classified as “unknown”.

As it is not a separate file type, there is no proper defined file structure for an .UNKNOWN file type. You can try to simply open the .UNKNOWN file using a text editor, if the file is a simple text format, the contents of the .UNKNOWN file can be read. Sometimes, the files with known extension are specifically marked with .UNKNOWN for privacy purposes.

.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

Last updated

.mmf 04/13/2023
.mup 04/13/2023
.itl 04/13/2023
.scs 04/10/2023
.crypt 04/10/2023
.pnp 04/10/2023
.tap 04/10/2023
.btr 04/03/2023