mixopterus_retexture.zip is a release file of the Minecraft resource pack Prehistoric Nature Mixopterus re-texture, made for Minecraft 1.12.2. It was published on July 20, 2022 and is 0.1 MB in size. For the full description, screenshots and every other version, visit the Prehistoric Nature Mixopterus re-texture resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.