Own a physical or digital copy of the game and dump it yourself using a tool like xextool or a modded Xbox 360. However, for the vast majority of users, the phrase "Xenia Roms Archive" implies searching for free, downloadable libraries.
Even with a perfect archive, Xenia is not plug-and-play. A high-end CPU (with good single-core performance) and a Vulkan-compatible GPU are essential. Many games still have graphical glitches, audio issues, or crashes. Check the before seeking out any title— Playable status is still rare compared to older emulators. xenia roms archive