: This is a standard Comic Book Archive file format designed for use with e-readers like CDisplayEx or Chunky Comic Reader. Farewell, Dragon World! | Dragon Ball Wiki | Fandom

: Indicates a "cover-to-cover" scan produced by the digital preservation group Aquila , which typically includes every page of the original physical release, including advertisements and bonus art.

: The volume begins with the high-stakes conflict against Kid Buu, where Goku and Vegeta must make a final stand to save the universe.

The original manga ended its run on . In North America, the final volume was rebranded as Dragon Ball Z, Vol. 26: Goodbye, Dragon World and released by VIZ Media on June 6, 2006. The "RCS 2018 08" Version

: After Buu's defeat, the story jumps ten years into the future to Age 784.

: Likely stands for "Re-Cloud Scan" or a similar digital release group designation.

The specific filename you mentioned— Dragon Ball Bye Bye, Dragon World (RCS 2018 08) [c2c Aquila] cbr —refers to a of the manga.