How to hide folders on a java phone(S40) without any software

Are you tired of your friends operating your phone with no mercy to the phone?
if yes then you need to lay your hands and ears on this tutorial.
I am very happy to let you know that you do not need any application to hide folder on your phone,all you need to do is just apply a little brain and your folder will be hidden in the sense that,no one will be able to detect if it is a folder or a theme.Now lets get started........
First,locate the folder you wish to hide,press option >> rename,then write the name you wish to name it and add .otb at the ending e.g My Browsers.otb

[This will Remove the Folder Icon]

I can assure you that with this,your friends wont know its a Folder, U can name it something confusing to make them confuse more.

STEPS TO CHANGE THE FOLDER ICON

This Will show you How to Change your Folder Icon to a Themes Icon, So that when your Friends sees it, They will thinks its a Themes and they wont want to Apply it..
Locate the Folder you wish to Hide or Change Icon of,press Option > Rename, then write the name you wish to name it and add .nth at the ending e.g Don't Apply.nth

[This will Change the Folder Icon to a Themes Icon]

After you must have renamed it,all you need to do is to move all your application into it.
Now we are going to look on how your folder can be restored to its formal or original state..
All you need to do is to locate the folder you have renamed and remove the {.obt and .hth },then your folder will be in its formal state