All files must have the exact same name, only differing by the part number (e.g., UNDODI2GB.part01.rar , UNDODI2GB.part02.rar ).

Use a tool like WinRAR , 7-Zip , or PeaZip . 2. Step-by-Step Guide

This file, UNDODI2GB.part01.rar , is the first volume of a . Large files like games or high-definition movies are often split into smaller parts to make them easier to download or store on limited space.

Move all these files into a single directory on your computer.

You cannot open only part01.rar . You need every part that belongs to the set.