Easy Enter your email address: You can hide your secret documents like photos , videos , songs and many more.. With the help of this trick ... Please follow the steps given... NOTE : Here I am using ES File Explorer as a File Manager... See more. Open your file manager then Select a file which you want to hide... Now change the extension and also change the name of file After changing the extension you cannot open that file... And If you have also changed the file name no one can open that file.. If you want to show that file.. Now change the extension... For Example Here ... Video extension is mp4 and I had changed it to xyz.. Now If you want to show that file change the extension to mp4.. Here you are.. Now you are able to see your file.. Hide this content.