cryptanon

I'm trying to extract the standing CGs to [Anim] Kago no Naka no Valkyrie, (v7167). I was able to do it with a previous version with no problem, but having since lost it and found a "new" version, I can't seem to figure it out. This version needs no extraction, only decryption, as it uses .cwp files. I can't seem to get arc converter to work if that's even the right tool. Garbro and other such tools I've attempted have been no help either (not surprising, as they're more for unpacking). Can anyone advise? Further, there's a weird thing I've never seen with any other game before. The game content seems to be only 300ish MB. But aside from setup.exe, the cg and audio files, there's a "blackbox" folder with 4 files named blackbox 1,2,3,4 respectively, each averaging 1.6 GB. When installed the game is only the 300ish MB. Strange.