How to lock any folder or file without any Third party Software

  (Caution!!! :- Don't try to Lock Your C Drive ,Otherwise Windows will not boot next time. )
This post describe how to secure your file or folders without any third party software.You can lock your files or folder using Comment Prompt in windows both windows XP and windows 7.
To do this Just open Command Prompt ,
Go to Start >> Run>>Command Prompt

In Command Prompt,
i ) For Lock Folder or File  :-

Type:  CACLS  "Folder name/File name with extension"  /E   /P   everyone:N
For example:- CACLS e:\sales\sale.txt /E /P everyone:N

Here,
       /E - Means Edit ACL (Access Control List)instead of replacing it.
       /P - Means User Permission
After it you can use Switches
       N - None - No permission to everyone
       R - Read
      W - Write
       C - Change (write)
        F - Full Control
i ) For UnLock Folder or File  :-
 
Type:  CACLS  "Folder name/File name with extension"  /E   /P   everyone:F
For example:- CACLS e:\sales\sale.txt /E /P everyone:F

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