Lock any folder without using any software (Windows)

1. Suppose you have a folder named abcd in D:\abcd.
2. In the same drive next to the folder create a new notepad file with the exact statement
ren abcd abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D}
3. Now save this text file as loc.bat
4. Create another notepad file and type
ren abcd.{21EC2020-3AEA-1069-A2DD-08002B30309D} abcd
5. Save this as key.bat
6. Now there are two batch files. Double click loc.bat and your folder will change into Control Panel and its contents cannot be viewed .
7. To open the folder double click key.bat and you get back your original folder.
8. 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)