The Encrypting File System (EFS) is a Windows file encryption feature of the NTFS filesystem that you can utilize to encrypt a folder or file. You will have toenable Windows File Encryption via NTFS EFS (Encrypting File System) on the filesystem-level first. Encrypt File and Parent Folder (Optional)A prompt may appear, giving you the option to encrypt just the file or the file and its parent folder. FAQ – Frequently Asked Questions About Windows EFS Encryption Is EFS encryption available on Windows 11/10 Home edition? In our other guide, we show you how to enable or disable Windows File Encryption via NTFS EFS (Encrypting File System) on the filesystem-level for all users.