Legal and distribution considerations
: Launch the sm64coopdx.exe application. On first run, it will request a Super Mario 64 .z64 ROM file. sm64 coop dx rom link
Background
: Most reputable modding forums and Discord servers prohibit the sharing of "pre-compiled" versions that include the ROM data to avoid legal action from Nintendo. Why It Matters and HD graphics.
: Support for widescreen (16:9), uncapped frame rates (60 FPS and higher), and HD graphics. sm64 coop dx rom link