When i download a part i could not open it and the name is something.rar and i can't open it with SW?

Download WinRar from here. http://download.cnet.com/WinRAR-32-bit/3000-2250_4-10007677.html
Install It. After installing follow these steps.

  1. Step 1:

    After installing winrar you can notice the change in icon of the rar file. Now right click that file and select extract to .

  2. Step 2:

    Some process will start and will end after few seconds and a folder will appear. Double click this folder and you can find all the files.