When you need to keep certain files secure and unreadable from unauthorized eyes, you can pay for lots of different applications, or you can us the free, open-source AxCrypt.
"Easy to use strong file encryption, integrated with Windows Explorer. Encrypt, compress, decrypt, wipe, view and edit with a few mouse clicks. Cryptographic primitives are AES-128 and SHA-1. A combination of strong symmetric encryption with compression and double-click editing/viewing. Encrypted files have a '.AXX' extension added to their names, and are shown with a new icon."
AxCrypt
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