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Animation Texture Collection format
Structure:
ATC (size 48 bytes) +0 DWORD Type (ATC type 0x29A5D1EC) +4 DWORD Animation file Type (FSH type) +8 DWORD Animation file Group (FSH group) +12 DWORD Animation file Instance +16 DWORD AVPF Type +20 DWORD AVPF Group +24 DWORD AVPF instance (zoom 1) +28 DWORD AVPF instance (zoom 2) +32 DWORD AVPF instance (zoom 3) +36 DWORD AVPF instance (zoom 4) +40 DWORD AVPF instance (zoom 5) +44 DWORD Number of frames in the animation file (per zoom and view)