Windows has built in support for .zip files but for .rar files you need to download a program called "WinRar". You can download it on their official site for free. Click here to download WinRar.
How to Extract a file.
1. Right click the file.
2. Choose Extract.
(Same step for unzipping a file)
Now how about .7z files? The 7z format initially appeared as implemented by the 7-Zip archiver. 7zip is a program like Winrar. You can also download 7zip for free on their official site. Winrar also supports .7z files so you can extract .7z files using Winrar. Click here to download 7zip program
How to Extract multi-part .rar files?
Put all the parts in 1 location or 1 folder. Right click the part 1 and choose Extract. It will automatically combine all the rar files.
