To decompress or unzip the folder on a Mac, double-click it.

To unzip or open a zipped file on a PC, drag the .zip attachment to the desktop. Once the file is on the desktop, you can double- or right-click to open it.

Or if you have 7-Zip or WinRAR, you can right click on any .RAR file and easily chose to extract the files from the menu. By default, files are extracted to the location as the original zipped file. 

Use the Select a Destination window to save the files somewhere else.