What is the file extension

file extension in any operating system - it's the last few characters coming after the point in the file name, for example: imyafayla.txt (text file) or imyafayla.zip (archive).They are intended to ensure that the programs installed on your computer can recognize how to work with the file.When incompetent change of expansion, such as .txt to .avi, the computer will not be able to open the file correctly.But sometimes you need to change the extension, for example, programmers working with HTML.The original code is written in a text file created by the program "Notepad", saved, and then manually change the extension to .html.This file is now opened by default as a web page using a browser.

How to see the file extension

By default, Windows XP does not allow the user to see the file extension.To
access them, open any folder in the top pane click "Tools", select "Folder Options."In the menu, go to the tab "View" to waste down the list and uncheck "Hide extensions for known file types."Then click "Apply" and close the menu.Now, in all the folders on your computer, each file will have not only the name of the part, but also the extension after it.Important clarification: the expansion - is the characters following the last period in the filename.For example, Fayl.exe.doc will be perceived not as a computer executable .exe, as well as a document Microsoft Word.It is important to always see the file extension.Until now, the Internet runs a virus disguised as a harmless text file.An inexperienced user of the hidden expansion sees the name as follows: "Read menya.doc," but in fact the full name of the file - "Read menya.doc.bat."This file can harm the system if it is registered in the "viral" code.Always be careful when opening files whose origin is unknown to you.

Change the file extension

This is an extremely simple operation.In order to change the file extension, click on it, right click and select "Rename".Highlight the part of the file name that comes after the point (typically three characters), and enter the required expansion of English letters.Then click the mouse anywhere else on the screen to deselect.A dialog box appears warning you that after changing the file extension may be unreadable.If you are sure that you entered the new extension is correct, click "Yes."