The name in your file——is a "watermark" intended to show the file’s origin and protect users from fake "impersonator" sites that often bundle malware with their downloads. The "Part 1" Mystery

A player searches for a way to play Gloomhaven without spending $60 on Steam or $140 on the board game.

The "story" of this specific file is one of :

When a user sees that specific file name, they aren't just looking at data; they are looking at the promise of a dark, mercenary-filled dungeon-crawler, compressed through heavy algorithms, and waiting for its other "parts" to arrive so the adventure can finally begin.

If Part 1 finishes but Part 7 gets corrupted, the whole game is unplayable. The "Part 1" file is the first step in a long journey of digital extraction. The Conclusion

The suffix is the most relatable part of the story for any gamer. Because file-hosting sites often have limits on how large a single upload can be, massive games are "split" into multiple smaller chunks.