If you look at a list of files in your computer, you can see that the file names consist of two parts, separated by periods.Obviously, the first part is the file name, but the second - extension - often consists of mindless, at first glance, a set of letters.
Extension is the same as a mandatory attribute of any file, as well as its name.The fact that the operating system is not able to intuitively determine whether the file is a program's title.The file name extension is intended to allow the operating system to "understand" what kind of program should be handled this file.Furthermore, in terms of expanding it to provide information about the file format, and the actions that need him to do.
Today, there are thousands of file formats and a comparable number of suffixes.Some extensions have traditionally been used almost from the beginning the spread of personal computers, such as the extension .exe (from the English executable - executable), which indicates the files that trigger this
or that program, while others have appeared recently.The fact is that many software products created for their work supporting files with unique extensions that can not recognize any other programs.And because the software on the market appears more and more, the number of extensions is growing every day.In addition, a growing number of different types of file formats: audio, graphics, video, and each of these formats must be its expansion.
user does not necessarily remember all the file extensions and programs associated with them.Many of the most common formats and extensions are automatically identified by the operating system, allowing the user does not think about what kind of program to open a particular file.
In modern operating systems with graphical user interface Identified often hidden file extensions, and the file format and the corresponding program icon appears certain.The problem is that several types of files may correspond to the same program, so it is sometimes more convenient to still allow the display of extensions.The family of Windows operating systems to make it possible, if the menu button "Start" select "Control Panel" and then click on the icon "Folder Options."In the tab "View" to find the item "Hide extensions for known file types" and take his check.Now you will see all the extensions.
decipher the meaning of a specific extension can be not so easy, especially if it is created for the file format support little-known program, but the list of the most popular name extensions can be found on the Internet.There are special sites that are not only prompt to exactly what the program needs a file with the extension of interest to you, but also help to understand how to decipher the letters that make up the extension.In most cases, the extension is either an abbreviation (for example, an extension of the popular graphics file formats .jpeg - an acronym for Joint Photographic Experts Group - was the name of the company that developed the format), or reduction.For example, the extension .dat, often used to support files with the information - an abbreviation of the English word data, which means "data".