.$efs is Encrypted EFS data
Key Features: .$EFS File Extension
|Created by||Microsoft Corporation|
|Category||Encoded and encrypted|
What is an .$EFS file?
The $efs file extension is mainly related to EFS files encrypted in Microsoft Office Word 2003.
In order to decrypt these files you need a proper certificate from the original creator of the document. EFS is short for encrypted file system.
This $efs file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.