This trick may not work on all computers
Lets say you want to lock a folder named PICS in your D:\ drive , whose path is D:\PICS
Then the code should be something like this:
ren pics pics.{21EC2020-3AEA-1069-A2DD-08002B30309D}
Pics is your folder name. Use the name of the folder in place for pics. Save the text file as lock.bat in the same drive.
To unlock this locked folder:
Open another new notepad text file and type the following:
ren pics.{21EC2020-3AEA-1069-A2DD-08002B30309D} pics
Save the text file as key.bat in the same drive. Here again, pics is the name of the folder. Change it to the folder you want to lock.