Есть идея, осуществимо ли?

[Freedom]

And You sorry: My English is very bad. Yes .DAT file it's container, include textures. And yes, PC version uses .png image for painting skins textures.
In Further, I will use translator:
The idea is to change the skins format dreamcast version, packing in .UNR container all the necessary files and run the dreamcast map on PC. But this proved to be very problematic since .UNR and .Dat not identical in structure.