The same TextureCompiler.exe tool will convert your tga back to a tex.
Here is a simple one-line batch file I use - I name the tga "target.tga", then rename the resulting "target.tex" back to what it should be.
texturecompiler "target.tga" "target.tex" -format tex
Once you have your new tex, you can put it back into the arc file with ArchiveTool.exe. Here is an example:
@echo off
echo !-------------------------------------------------!
echo !Welcome to Sharks Ultimate Replacer 2.0 !
echo !-------------------------------------------------!
echo -------------------------------------------------
echo Please stand back, or you might get hurt!
echo -------------------------------------------------
md .\pc\female
copy /Y femalepc01_white.tex .\pc\female
copy /Y femalepcskirt01bmp.tex .\pc\female
archivetool "resources\creatures.arc" -replace "pc\female\femalepc01_white.tex" "resources\"
archivetool "resources\creatures.arc" -replace "pc\female\femalepcskirt01bmp.tex" "resources\"
echo -------------------------------------------------
echo Work finished!
echo -------------------------------------------------
echo Application should now be closed.
echo -------------------------------------------------
pause
OR you can simply create the proper folders in
C:\Program Files\THQ\Titan Quest Immortal Throne\Database and put the tex's there. See this thread for an example:
Skins For Dummies