In a part-18 file for an HD texture pack, you would likely find:
What is the texture pack for? (e.g., Minecraft, Skyrim, Fallout) What is the total number of parts in the set? HD-Texture-Pack.part18.rar
Since "HD-Texture-Pack.part18.rar" is typically one piece of a large, split archive, the content inside is usually a continuation of high-resolution image files and configuration data. In a part-18 file for an HD texture