Do you have (part01, part02, etc.) in the same folder?
You cannot open just part 19. All parts (part01 through the last one) must be in the same folder to reconstruct the original file. 2. Requirements for Extraction To use this file, you will need: E2GB.part19.rar
This indicates there are at least 19+ files (part01, part02, etc.). Do you have (part01, part02, etc