Gildor, I'm positive that the textures are in the .blk file.
Here is why:
MANIFEST.MF defines all the files for the game.
Notice that for each bulkcontent file (minerva_alevel.blk, minerva_blevel.blk, minerva_clevel.blk), it points to the .blk file that was included with the DLC.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; bulkcontent files
[c4catalog.bdc]
FileName=singleplayer\c4catalog.bdc
Priority=2
[bulkcontent\c4catalog.bdc]
FileName=singleplayer\c4catalog.bdc
Priority=2
[bulkcontent\minerva_alevel.blk]
FileName=singleplayer\bulkfiletexturesdlcfour.blk
Priority=2
[bulkcontent\minerva_alevelanimgroups.blk]
FileName=singleplayer\bulkfileanimgroupsdlcfour.blk
Priority=2
[bulkcontent\minerva_blevel.blk]
FileName=singleplayer\bulkfiletexturesdlcfour.blk
Priority=2
[bulkcontent\minerva_blevelanimgroups.blk]
FileName=singleplayer\bulkfileanimgroupsdlcfour.blk
Priority=2
[bulkcontent\minerva_clevel.blk]
FileName=singleplayer\bulkfiletexturesdlcfour.blk
Priority=2
[bulkcontent\minerva_clevelanimgroups.blk]
FileName=singleplayer\bulkfileanimgroupsdlcfour.blk
Priority=2
I don't want to download gigabytes just to check whether I will be able to extract a few textures ...
It's only 350 megs zipped, not gigabytes