No need of another software to lock folder you want....its easy to lock it from command prompt.
For example: if a folder in D: drive named abc then it will lock by command like this:
open command prompt and follow this-
D:\ren abc (here you have to hold alt key then type some numbers from num. pad of keyboard) then it shows a binary symbol (not like a.b,c,d)then press enter...then check that folder from my computer if not locked try different numbers by holding alt key
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