This specific file is most commonly found in "Deep" or niche gaming forums and Discord servers dedicated to Wii U emulation. Because Xenoblade Chronicles X has a massive world with complex assets, XCL acts as a "layer" that sits between the game and the emulator to optimize how the hardware handles the game's data.
The filename is a compressed archive typically associated with the Xenon Control Layer (XCL) , a community-developed modification or "mod" for the PC version of Xenoblade Chronicles X . Technical Breakdown XCL_0.16d.part01.rar
This refers to the specific version of the mod. In development cycles, "d" usually denotes a minor revision or "hotfix" following version 0.16 to address specific bugs or compatibility issues. This specific file is most commonly found in