Lock any folder without using any software.

Lock any folder without using any software.
Suppose you have a folder named abcd in D:\abcd.

In the same drive next to the folder create a new notepad file with the exact statementr
ren abcd abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D}.

Now save this text file as loc.bat.

Create another notepad file and typeren
abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D} abcd.

Save this as key.bat.

Now there are two batch files.

Double click loc.bat and your folder will change into Control Panel and its contents cannot be viewed .

To open the folder double click key.bat and you get back your original folder.

For more safety keep the key.bat in another location . Only for unlocking copy paste to the original location and double click

(don't forget to replace abcd with the folder name)