SDK supports reading and writing both. While neither of the formats is documented, the ASCII format is a tree structured document with clearly named identifiers. For the FBX binary file format, the Blender Foundation published an unofficial specification, as well as a higher level unofficial spec (work in progress) for how actual data is laid out in FBX (independent of ASCII or binary format). List of FBX versions (and alternate names in brackets): 6.x (FBX 2006, FBX 2009, FBX 2010) 7.1 (FBX 2011) 7.2 (FBX 2012) 7.3 (FBX 2013) 7.4 (FBX 2014) 7.5 (FBX 2016.1.2) See also dotXSI COLLADA VRML X3D Autodesk Gameware glTF JT References External links Autodesk FBX Blender FBX description 3D graphics file formats 3D graphics software