RAR is a compression format, it is used to make files smaller and download friendly. To open a RAR file you can use WinRAR to extract the files. The only problem with WinRAR is it costs money although you can download a trial version. My personal favorite program to extract files is 7-Zip it supports RAR files and it’s free.
After you have download 7-zip or WinRAR and installed it, you can begin to extract rar files. Find the file you want to extract and right click on the file, look for the 7-zip or WinRAR and choose “Extract Here” and the program will begin opening the files. You can extract the files in a specific folder too, instead of choosing “Extract Here” click on “Extract File” and choose the folder you want extract the files to.