If you obtained this file from a third-party or unofficial source (as the "proper piece" phrasing sometimes appears in community-shared archives), be aware that is a paid game available on Steam . Using cracked or unofficial versions can prevent you from accessing the Steam Workshop, which is where the majority of the game's community-made mods and additional fireworks are hosted.
This file appears to be a specific update version of the explosive simulator game . The "v2021.12.7" designation refers to the update released around December 2021, which focused on graphical improvements and bug fixes to enhance the "glow" of fireworks and tools. Key Details of Version 2021.12.7 If you obtained this file from a third-party
: A notable fix addressed a bug where smoke appeared black at night; it was corrected to look more natural during explosions. The "v2021
: Ambient sounds in maps like "City," "Flat," and "Ranch" were slightly lowered. Important Safety Note Important Safety Note Fireworks Mania :: Release of
Fireworks Mania :: Release of Multiplayer Update - Steam Community
: Adjustments were made to ambient light and stars to make nighttime firework shows less distracting and shadows more realistic.
: The update increased the "glow" intensity for tools and native firework materials to make effects look more vibrant.