I've been playing around a bit - seems like I can open UIMovies.mas, Fonts.mas and Sky.mas, but CoreShaders.mas and Weather.mas fail to open with "Unknown MAS key." message. Does that mean some .mas files are locked? I'd like to use open-beta period to familiarize myself with shaders used in rF2 (among doing other things of course ) I assume that some things are still in development and it wouldn't be wise to work with stuff like shaders or .GMT files at this stage, but familiarizing myself should be pretty harmless. Besides, the better I understand how things work, the more valid feedback I can provide. Of course it's not that kind of feedback that has the priority now, but some work on graphics will be done in the open beta period, I presume?