You can lock and unlock any of your folder in computer with this simple trick !
Procedure Make a folder on the desktop and name it as folder
Now,you need to open notepad and write ren folder folder.{21EC2020-3AEA-1069-A2DD-08002B30309D} and now (Notepad Menu) File-->save as.
In the 'save as' name it as lock.bat and click save Save it on Desktop
Now, again open notepad again and write ren folder.{21EC2020-3AEA-1069-A2DD-08002B30309D} folder and now (Notepad Menu) File>>save as.
In the save as name it as key.bat and click save.. Save it on Desktop
Now, double click lock.bat to lock the folder and now if you open your folder, control panel will open up.
Now, double click key.bat to open the folder and now if you open your folder, you can access your data inside the folder again.
Lock your folder and hide the key.bat somewhere else on your hard disk.
Whenever you want to open your folder just paste the key.bat on desktop and open your folder using it.
Its Simple