FE is a free tool that is used to encrypt files, as its objective is to guarantee the security of data that could run the risk of being consulted, edited or destroyed without the knowledge of the owner user, and for this purpose it uses secret keys.
To encode a file, simply select it and type a password password (and which only knows, of course, the owner of that file). To decode that file, you simply have to reverse the process.
The most remarkable thing about FE (apart from being free) is that it hardly consumes system resources.
You can free download FE 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.