How to make Desktop folder more secure

Step:1 open command prompt
Step:2 type "cd desktop"
then Enter
Step:3 type "cacls foldername /E /P everyone:n
Step:4 folder lock!!!!
now to open folder do all things again but here is one change type f instead of n 

cacls foldername /E /P everyone:f... 
Akash Rupareliya