The file extension is needed so that the operating system can recognize its type and open it. To do this, she uses the right program. But there are times when a certain file does not open, for example, if it is downloaded from the Internet. To open such a file, you need to register it with the extension. Then it will be opened by the corresponding program. If the program is not there, you also need to install it.
Necessary
Computer with Windows OS (XP, Windows 7)
Instructions
Step 1
On most operating systems, the file extension is hidden for security reasons. This is done so that when renaming a file, the user does not accidentally change its extension. In this case, the file will not open. Before registering the extension, you must enable the display of the extension in the file name.
Step 2
To enable the display of the extension in the file name in Windows XP, open any folder. After that, at the top of the toolbar, select "Tools" and go to the "Folder Options" section. Then select the "View" tab, and in it find the item "Hide extensions for registered file types". Uncheck the box next to this item.
Step 3
Now you can add the desired extension to the file. To do this, right-click on the file. In the menu that appears, select "Rename." After the name of the file, its extension is immediately written. Write the extension according to the file type. For example, the doc extension is typical for Microsoft Office documents, and docx since 2007.
Step 4
For those who use the Windows 7 operating system, this method is suitable. Left-click on the "Start" button. Next, in the search bar, type "Folder Options". From the results found, also select "Folder Options", then - the "View" tab. Uncheck the box next to Hide extensions for registered file types.
Step 5
Now, in order to register the extension, select "Rename" in the context menu of the file. On this operating system, the file name will be highlighted. The file extension must be written immediately after the highlighted part of the name. After the file has an extension, it will be opened by the program that is the default for these types of files.
