GregTech is loading... GIF

[OvermindDL1]

@Gregorius

Edit 2: Okay I just tried to replace it within GT6, but it did not load my Version, so I am certain I cannot change it easily without lots of hacking and potential ASM fuckery.

As I recall it has a special resource pack loader or something like that, no ASM needed, but designed to be replaced by modpacks or so.