The first file in map dir (for example 26/3964) are archived pack. The second file in pack are usual 3dmodel. Though i still don't know where textures are. Hope you find it =) There are all 3d models placed on map (cities, dungeons, yagdrasil)
Others files in pack are still unknown, but there must be animation for 3d models somewhere. And hrc for them because all parts of model of city are started from zero position.
The second file in map dir (for example 26/3965) are archived pack of map textures. There are always six of them. They are usual tim without modification.
The third file (for example 26/3966) are archived textures of skyes. And maybe something else (need to be further analized)
Next five files are music.
And last two files are map itself =)
As for the archive. Its almost the same as in ffvii some lzs modification. I don't rememder diferences. Please look at my class for extract it. (if you write description of it for XENO-GEARS it would be wonderful ^_^).
http://server.titansoft.ru/akari/xenogears/engine.rar (src/resource/archive/archive.cpp)
Where are the filed maps stored?
What are field maps?