I found a program to view the DDS files without needing to install anything on your computer:
http://www.amnoid.de/ddsview/download.html . They look awesome.
By the way, are these the maximum resolution of the textures? I'm sure they looked better than this on the screen. In particular, #11 from Raisin's Cave (which has the rockart) really doesn't look big enough to have covered the whole roof.