: Right-click on part1 and select "Extract Here" using software like WinRAR or 7-Zip . The software will automatically pull data from all subsequent parts to recreate the original file.
: A popular tool for recording video from a webcam, screen, or external device. A file named this way might be a partitioned installer or a recorded video project saved in parts. 2. Video Game or Mod Content Debut.part1.rar
In online file-sharing communities, "Debut" is a common term for: : Right-click on part1 and select "Extract Here"