The naming convention Dt80-200e-x64.cpk tells us exactly what the file does:

In the world of Pro Evolution Soccer (PES), files are archive containers used to store game assets such as graphics, stadium data, and player models. The "dt80" prefix specifically identifies files related to official Konami Data Packs (Downloadable Content or DLC). dt80_100E_x64.cpk : Represents Data Pack 1.0. dt80_200E_x64.cpk : Represents Data Pack 2.0. dt80_300E_x64.cpk : Represents Data Pack 3.0, and so on.

Why? Because mods contain their own, updated databases. If you run a massive patch like VirtuaRED V3 or Smoke Patch 21.4.0 , they bundle an EDIT00000000 file and a custom dt80 equivalent. If the original dt80_200e_x64.cpk remains in the /data/ folder, the game will read files. This results in:

It serves as an official update file that adds or modifies game content. On Steam, it is part of the game's "download" depot (Depot 1259971). Common Usage and Troubleshooting