To extract it you will need a program like winrar or 7-zip. I know there is a free version of 7-zip and there might be one for winrar too. I am pretty sure winrar will at least allow you to extract the files you need.
Install the program, double click your rar file and the Sims3 files inside will be shown in a dialog box. Drag the files you need into the folder you want and you are done!
Once you have the files in the folder you can safely delete the rar file.
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A rar file is compressed like a zip file.
To extract it you will need a program like winrar or 7-zip. I know there is a free version of 7-zip and there might be one for winrar too. I am pretty sure winrar will at least allow you to extract the files you need.
Install the program, double click your rar file and the Sims3 files inside will be shown in a dialog box. Drag the files you need into the folder you want and you are done!
Once you have the files in the folder you can safely delete the rar file.