dst-exts.txt

.arkfaceactor           139 entries, 43kb to 50kb
.arkfaceanim           1476 entries, 741b to 2mb
.bcloth                 147 entries, 46kb to 1mb
.bcs                      1 entries, 120kb, binary, appears to map fx to materials (contact system)
.bimage7              19364 entries, 90b to 32mb
.bimage7_mip0         11452 entries, 64kb to 16mb
.bimage7_mip1          7836 entries, 128kb to 4mb
.bimage7_mip2          3666 entries, 128kb to 1mb
.bimage7_mip3           382 entries, 128kb to 256kb
.bmd6model             1644 entries, 49b to 1mb
.bmodel                5587 entries, 378b to 2mb
.bprobe               71594 entries, 8kb to 41kb
.dat                      3 entries, 3kb, appears to be font data
.decl                 60567 entries, 2b to 1mb
.edgeanim             11868 entries, 304b to 2mb
.edgeskl                408 entries, 704b to 57kb
.hkx                  13800 entries, 65b to 141kb
.iggy                   247 entries, 24kb to 58mb
.iggytex                237 entries, 0b to 14mb
.imp                     24 entries, 0b to 330b
.lang                    11 entries, 724kb to 1mb, text, string lookup/translation table
.maprscreusechunk0       33 entries, 67kb to 237kb
.massProps              705 entries, 568b
.pmodel                 626 entries, 140b to 950kb
.ragdoll                344 entries, 58b to 1kb

# seem to be per-level
.bnavmesh                36 entries, 99kb to 26mb, binary
.bphysworld              36 entries, 252kb to 52mb, binary
.bwm                     36 entries, 4mb to 200mb, binary
.cfg                     36 entries, 13kb, text, list of parameters
.entities                35 entries, 744kb to 39mb, text, major level definitions, where entities are, mat overrides, spawn locations, etc.
.mapresources            38 entries, 24kb to 623kb, binary, 12 byte header, 28 byte entries, indexes into resource files?
.probesnetwork           36 entries, 2mb to 306mb, binary
.soundpropa              36 entries, 3kb to 30mb, binary
.tome                    36 entries, 200kb to 95mb, binary