App encrypts and decrypts folders and files using secure AES encryption. This App is an interface between you and Windows 10 using a Locker concept. App allows switching between multiple Locker folders. Each Locker folder can store unique content using different passwords. After you encrypt a folder or file, you can attach it to an email and send to someone else. If they have this App and know the password, then they can decrypt file, edit it, encrypt it again, and send it back to you.
As mentioned above, App is an interface. Once your content is decrypted, it is open to use by any App on your device that can process it. Once you are done, then encrypt it again.
App does all this by converting your folders and files to zip files and then encrypts them using your password. App then does reverse by decrypting your encrypted zip files and extracting content back to original folders and files. Encryption and decryption is a manual process that you control. Upon verified access to your locker, encryption state is where you left it at last time. App does not automatically decrypt your locker on access or encrypt it again when you exit. You must do all that manually.