The file is an image file containing the v2.0 build of the game Dome Keeper , bundled with the Deluxe Edition bonus content.
The "proper" contents you should expect within the Deluxe Edition, as specified by official Steam listings , are: Dome.Keeper.Deluxe.Edition.v2.0-P2P.iso
: The core Dome Keeper roguelike mining game where you defend your dome against waves of aliens. The file is an image file containing the v2
This specific "v2.0" build likely refers to a major milestone update in the game's development cycle, which often includes balance changes, bug fixes, or new gameplay features like the Springloaded or Double Dome updates seen in earlier versions. as specified by official Steam listings