Use a tool like WinRAR , 7-Zip , or PeaZip . 2. Step-by-Step Guide
You cannot open only part01.rar . You need every part that belongs to the set. UNDODI2GB.part01.rar
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