this bms script will split and decompress the bct textures from your tex samples
Code:
# script for QuickBMS http://aluigi.altervista.org/quickbms.htm
idstring "\x06\x05\x04\x03"
get TEX_INFO_SZ long
get TEX_SZ long
get FILES long
get TEX_HEADER_SZ long
get STRING_TABLE_OFF long
for i = 0 < FILES
get NAME_OFF long
get HASH long
get ZSIZE long
get SIZE long
get OFFSET long
get PADDING_SZ long
get COMP_FLAG long
savepos TMP
goto NAME_OFF
get NAME string
set NAME basename NAME
string NAME + .bct
if COMP_FLAG == 0
log NAME OFFSET SIZE
else
math OFFSET + 4
math ZSIZE - 4
comtype zlib
clog NAME OFFSET ZSIZE SIZE
endif
goto TMP
next i
i have not looked at the formats of the extracted *.bct yet, just wanted to at least get this posted for now.

edit
just found this script on Xentax but it looks like it doesn't decompress any files so we are still good.
http://forum.xentax.com/viewtopic.php?p=48763#p48763edit2
there is also gibbed tools for working with this game but i didn't try it
http://deadrising.wikia.com/wiki/Mod:Gi ... ling_fileshttp://www.mediafire.com/?nfvixrepf530sm2