Well let's change exe to jpg file in a minute, I will also teach a bit of social engineering:
This is used in windows7 in other systems do not know, maybe given ...
*We take the exe file that we will change.
*and open the character map, if you know where you are, easy to give a look
*Now we are going to change the extension to the file, delete exe and replace it with (com)
*Now let's change the extension to JPG, open the Character Map and select the font ARIAL.
*Now choose U +202 E, we give to select and copy
*Now go to the file that had changed the extension to "COM" and type a single space.
---------photos .com------------
*Now is when it comes a bit of social engineering, for example we write a word that makes the file is trustworthy, such as "Playboy"
---------photosplayboy .com------------
*Now paste the character you have copied the map of characters and write "GPJ" FREE QUOTES.
---------photosplayboycom.jpg------------
*And we finished, we have introduced the character he does is to reverse the simple words if, as you can see we have camouflaged exe file like a JPG, and also have used social engineering to make our file to be fully trusted, and we can only change the icon and order.