Advice 1: How to change the file extension on the video

Sometimes after downloading a video file from Internet it does not open and you receive a notification that the operating system could not open the file. It is also proposed to choose a program to open it manually. The problem is that, most likely, that file is not written to the correct extension. And without it OS doesn't know what program to use to open it. This problem is quite solved. All you need is to assign the correct extension.
How to change the file extension on the video
You will need
  • - computer with Windows.
Instruction
1
If you are using Windows XP operating system, then change the extension of the file in the video can be this way. Click on the file with right-click. In the context menu select "Rename". The extension of the file follows immediately after the name, after which you need to register. In most cases, the extension of the videofile, Avi. But, of course, may be other options, such as 3gp, this format is often used in mobile phones. If the video is in DVD format, its extension is Vob.
2
May be a case where the extension files in Windows XP is not displayed. To activate the display please follow the steps below. Click on any folder, right-click and from the context menu select "Properties". Then go to the tab "View". There find the line "Hide extensions for known file types". Clear the check box next to that line. Save the changes. To do this, click "Apply" and OK. Now you can change the extension of files.
3
In Windows 7 the default extension of the files is not available. To activate it, you must do so. Click "Start". Go to "control Panel" and open "folder Options". Next go to the tab "View" and uncheck the box next to "Hide extensions for known file types". Click Apply and OK. Now you can change the extension of the file.
4
Click the right mouse button and select "Rename". You will see that the name of the file will be highlighted, followed by its extension. That is the Unallocated part and you want to rename. If you see only the selection, this means that the video file is not registered any extensions that you should add immediately after the name of the file.

Advice 2 : How to change file format rar

Format .rar indicates that the selected file is an archive. In the archive, you can store folders and files. To change the file format .rar in several ways. It all depends on what the user needs.
How to change file format rar
Instruction
1
Ready in the archive, you can add new files. Open the archive by clicking on it with the left mouse button. Or click on its icon, right-click and select the context menu command "Open". You can also select the file .rar and press Enter.
2
In the opened window, click on the "Add" button. In the advanced window, specify the path to the file you want to archive, click the OK button and move to "Name and archive settings", then press OK. The file will be added to the archive. The same can be done via the menu "Commands" and "Add files to archive".
3
There is a quick way to add new files. Select the file you want to archive, hold down the left mouse button, drag its icon so that it was on the file format .rar. Release the mouse button – the file will be Packed in the chosen files.
4
To remove a file from the archive, open the RAR file, highlight with your mouse the files and folders that you no longer need, and choose from the menu "Commands" click "Delete files". Alternatively, click on the file (group of files), right-click and select in context menu "Delete files". Confirm your action in the query window. The fastest way: select some file and press the Del key. Confirm the deletion.
5
The files in the archive, you can assign new names. Menu Commands (or via the dropdown menu after clicking right mouse button on the file) to select "Rename the file". When a field name changes, enter the new name and click anywhere on the screen with the left mouse button or press the Enter key.
6
To change the contents of files Packed into the archive, open the archive and the file you want. Double-click the left mouse button on the chosen file or highlight it and press Enter. Make any necessary changes, and save them in the usual way. The system will warn you that the file is modified after the closing of the applications using it. Close the program that made changes to the file and in the window that appears, answer Yes to the proposal to update the file in the archive.
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