This file format is documented as of Overwatch Version 188.8.131.52, it does not correspond to version 184.108.40.206.
In 220.127.116.11 Overwatch designates different file sections with 4 character identifiers.
Chunks are wrapped in a Common Chunked Format
Dynamic Model Child Entity
ulong model; // 00C file ulong material; // 01A file ulong animation; // 006 file ulong start_at_frame;