I m sorry for lateness in IGM subs skinning progress, but I been very busy with preparation/studding for exams and I don’t work on my mod.
Yesterday I try extract TGA textures of sub hulls from .dat files “data\Submarine and from data\Objects” with tool Pack3D but this tool always show me THIS “java.lang. Negative.Array.SizeException” error when I try open .dat files in “data\Submarine” folder and most .dat files in data\Objects folders. 
See picture:
I only can open some .dat files in “data\Objects” folder such as “Turm2A_1_hd.dat” or “Turm9c_1_hd.dat” in these files I find some sub hull textures but only texture from Type II subs is maybe valid for reskinning, for I Type IX don’t find proper hull texture in this .dat files, Type VII sub “Turm7b_1_hd.dat” can’t open and Type XXI sub .dat I don’t find in “\data\Objects”.
With which tool I can extract .TGA textures from .dat files?
Thanks for help.