IDontLikeColorfulGregTechCasings-1.12.2-1.0.0.zip is a release file of the Minecraft resource pack I Don't Like Colorful GregTech Casings, made for Minecraft 1.12.2. It was published on March 9, 2020 and is 0 MB in size. For the full description, screenshots and every other version, visit the I Don't Like Colorful GregTech Casings resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.