BTK Docs

File Structure
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-J3D Header
-BTK Header
-Animation data
-String table
-Float data

J3D Header
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0  - J3D version ("J3D1")
4  - File type ("btk1")
8  - File size
16 - Number of sections (1)
20 - Some signature ("SVR1")
24 - Padding (0xFFFFFFFF repeated thrice)

BTK Header
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0  - Signature ("TTK1")
4  - Section size
20 - Animation data offset
28 - String table offset
36 - Float data offset 1
40 - Float data offset 2

String table header
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0  - Number of materials
2  - Padding (0xFFFF)
4  - String table entries followed by data

String table entry
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0  - Unknown
4  - String offset from start