How to Encrypt Files Using AES Crypt for Windows
AES Crypt is an open source application providing file level based encryption the latest version is available at https://www.aescrypt.com/download/
a. Install AES Crypt on your system.
b. Open Windows Explorer and select a file to be encrypted, right click on the file, and select AES Encrypt from the drop-down menu.
c. Enter a strong password and select OK. This will create a file with the same name but with an .aes extension.
d. Depending upon where the original file is located, it may be necessary to delete it.