Donkey Kong Country: Tropical Freeze

Donkey Kong Country: Tropical Freeze is the most recent Retro release, and their first game on the Wii U; along with the new console came a large overhaul of the engine, with a lot of old formats being removed, a lot of new ones introduced, and a lot of the remaining ones being overhauled completely.

Formats

 * ANIM: Animations
 * ARC: Archive
 * CABH: Audio bus heirarchy
 * CAUD: Audio metadata
 * CHAR: Characters
 * CMDL: Generic models
 * CSMP: Audio samples; music and sound effects
 * DCLN: Collision OBB tree group
 * FSMC: AI finite state machines
 * GENP: Particles
 * GFX: Unknown
 * GFXL: Unknown
 * MP4: Videos
 * LDTA: Controls setups
 * MSBT: Strings
 * MTRL: Shaders
 * PAK: Packfile
 * ROOM: Level data
 * RSTC: Unknown
 * SKEL: Skeletons
 * SMDL: Skinned models
 * SWSH: Particle swoosh data
 * TXTR: Textures
 * UINF: Universe info
 * WMDL: World models
 * XFRM: Unknown

Trivia

 * There's a lot of leftover remnants of a PC build running on DX11 that was presumably used during development, including an archive of compiled HLSL shaders, numerous references to DX11, and a controls setup for PC.