The archive contains dff, txd, col, IDE, ipl and img files. All models and textures are stored in the gta3.img folder. IDE, IPL and COL files from DATA can be added to gta_vc.dat via IDE DATAMAPSatint.IDE IDE DATAMAPSatnbhotelint.IDE
There is an IMG file that stores everything that is in the gta3.img folder. The fact is that in the sun you can add img files from which, just like from gta3.img, objects and textures will be delivered. This is done by adding the lines CDIMAGE / path to the img archive / archive.img (Perhaps this is done differently, I don’t remember)
The idea was to create interiors for each of Tommy's houses. This is the third attempt and it failed again. But here I did everything more systematically and some of the materials can be used. Also, all interior objects are listed in a separate IDE and COL file. it was meant that it could develop into a library for easy creation of interiors, where there will be separate objects of walls, floors, ceilings, interior objects, from which it will be possible to easily assemble your interior.
I have no desire to do this anymore, but it's a pity to just delete everything that I made / ported from sa / remade from standard objects.
There is a video of one of the interiors, because of this int, an error pops up when loading part of the map, but if you start the save from there, the game does not crash.