You can password protect a folder in Windows 10 using a program called WinRar, which is free to download and use.

Lock Folders When you lock a file or folder, it becomes invisible to Windows and all Windows program. From the Lock Folders page you can unlock items or, more likely, temporarily remove protection so ...

In a nod to security by obscurity, Folder Lock's Stealth Mode hides the program so nobody snooping your PC would even know it's there. If you want to access the hidden program, you simply press the ...