First the new archive with dxt5 textures:
https://www.dropbox.com/s/17lnryw5mq1osdy/rawtexturesdxt5.tar.gz
I'm not sure if the tool exists for the Windows environment so i'll post how i did it in Linux.
1. First i installed the package libnvtt-bin (nvidia texture tools). It is included in ubuntu repositories.
sudo apt-get install libnvtt-bin
2. now i got several commands to work with, among them nvcompress and nvdecompress
3. i made two scripts to work with files in batch
- first one is compress.sh:
for x in `ls *.tga`; do
nvcompress -bc3 $x && echo "compressing $x"
done
- second one is decompress.sh:
for x in `ls *.dds`; do
nvdecompress $x && echo "decompressing $x"
done
4. set the executable flag on both of them so they can be run
5. place decompress.sh in the directory where the dds files reside. Then run in terminal ./decompress.sh. It will convert them all to tga files.
6. move the tga files into a different directory and put the compress.sh file in there too. Now run in terminal ./compress.sh. It will convert all tga files into dds files with dxt5 format. Now the dds files can be copied to the respective mod's texture subdirectory for use.
(The format can be edited in the compress.sh file according to this wiki page
https://code.google.com/p/nvidia-texture-tools/wiki/CommandLineTools. Just replace -bc3 with something else.