It's on the in_cube page. All versions of adXtract after 0.0 are "adXtract2". It may not work with large (>2GB) files, be warned. I have a v0.3 with large file support but for whatever reason I haven't put it up yet.
I feel like an idiot for asking this, but how exactly do you use it? I just downloaded it, and it appears to be one of those DOS sorts of things. I read the "BUILD" text doc but couldn't make too much sense out of it.
(I'm still very new to all this, so please bear with me--I'm learning everything little by little! =0)