Source: https://github.com/arbruijn/d2x-xl
D2X-XL-ar is an update for "D2X-XL with stability, compatibility and build fixes" by Arne de Bruijn. Note that the front page of the github currently gives a link to Version 1.18.74-ar10, but the latest version listed in the releases is Version 1.18.74-ar12.

v1.18.74-ar12 Latest […]
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v1.18.74-ar12 Latest

Fix music playback error at end of song

v1.18.74-ar11

Add support for png files in custom missions
Restore countdown flash intensity
Restore fusion flash effect intensity
Support D1 demo files
Improve AMD OpenGL compatibilty on linux
Better support for side-by-side 3D (by Noric Forge)
Fix audio when using a non-ascii path
Fix oof models without rotation animation
Fix guidebot crash with energy center

Downloads: https://github.com/arbruijn/d2x-xl/releases