Hi Guys, This is Vicky again. I'm having an issue with renaming files extension. I've renamed an untitled file extension in DOS mode. Which worked successfully. Eg. Suppose i'm having a file OK.txt.. and i've renamed it to OK.psd. I want that other person who accessing that file should not know that its a .txt file. or he should not change the file extension anyway by using any renaming software or in DOS mode. I hope all you people understand what i want.