How to Lock Your Folder without any software in XP

We use many software to lock folder but we can do it manually by a small code(using shell extension).
STEP 1
right click on your folder and click rename.
STEP 2
At the last of the folder name paste add ".{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}".{without quotes}
STEP 3
Press Enter Key and try to open the folder.

Your folder is locked.



UNLOCK PROCEDURE:

TO UNLOCK:We have to rename the folder to "folder name"
Step 1:
open command prompt
 and go to the parent folder

example:  We have l folder d:\sonu\secret

after locking is will become
secret.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}

Go to parent folder of secret which is D:\sonu using command
cd d:\sonu
d:

now you can see list of files and folders using dir.

step2.
Rename the folder to secret..{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}  to secret.

ren secret.{2559a1f2-21d7-11d4-bdaf-00c04f60b9f0}   secret

Done.