About a month ago now i downloaded a .zip file but i got an error message saying somthing like file not found when i opened it, so i opened it with notepad(i regret this now) a load of code appeared so instinctively i just closed it. every thing seemed normal untill i opened another .zip file, it opened with notepad. so i changed it to open with windows explorer now the icon is not a .zip like normal it is a piece of paper with a computer in the middle.

If any one knows how to return the icon to normal please help.