MP4 , a universal digital container that balances high compression with excellent image quality.
Often paired with High Dynamic Range (HDR) support to provide deeper color contrast and more realistic lighting.
Many developers offer these 4K files as optional DLC (Downloadable Content) to save storage space for players using 1080p monitors, as 4K packs can increase total game size by over 100 GB. Age of Empires IV: 4K HDR Video Pack - Xbox
Likely a pre-rendered story cutscene or a reward video, as 4K video packs for games like AoE4 typically focus on cinematic sequences rather than real-time gameplay. Featured Benefits