ExtMania (File Extensions Management System) is an utility for managing file extensions and programs intending for opening and displaying files of certain types. Possibly, many can remember a situation when a just installed program, without informing you, associates with itself certain files that you are used to open and read with the use of some other utility. On the other hand, many of you are aware of that some Internet browsers work faster and are more stable, while others display certain types of pages more correctly. This is why sometimes you would rather use a certain program or, on a different occasion, some other. ExtMania makes this very easy and convenient. The utility creates lists of programs working with certain types of files (having certain extensions). Now, when you click on any file in the Windows Explorer, a small dialogue box, which looks not unlike the standard "Open with..." dialogue, opens. It will offer a list of programs working with this type of files. The ExtMania allows one easily managing this list of programs associated with the file type you choose and delete or edit each program's properties, such as starting parameters or icons. Besides, and this is the most interesting feature, ExtMania monitors all file associations and automatically adds newly installed programs to the lists. ExtMania will immediately alert you to any attempt on the part of any program to associate any one file type with itself.