These simply cover the desktop with an "always on top" window. They do not encrypt files and can often be bypassed by booting into Safe Mode or using specific keyboard shortcuts.
Tools like Winlocker Builder 0.6 generally produce two types of screen-locking software: winlocker builder 06 upd
Modern security suites like Kaspersky and Windows Defender treat these builders as "Hacktools" or "Malicious Tools" and will often delete them immediately upon download. How to Remove a Winlocker Infection These simply cover the desktop with an "always
A user-defined password that must be typed to release the lock. Types of Winlockers Created winlocker builder 06 upd