The term could refer to a few different things depending on your goal:
If you have already downloaded Parts 1 and 2, please keep the following in mind to ensure a "proper" extraction: Download patch part3 rar
You only need to right-click Part 1 and select "Extract Here" using WinRAR or 7-Zip . The software will automatically pull data from Part 3 to complete the file. The term could refer to a few different