Scav found out that someone reverse engineered my car mesh format that I created for RalliSport Challenge 1 (PC & Xbox) for about 4 years ago. It appears that they are trying to convert all the RSC1 cars from the PC version to Xpand Rally which, obviously, has a quite alive and fanatic mod community.
The format they reverse engineered is called CarMesh (.cm) and is quite basic. Each mesh contains a list of LODs and each LOD has a list of renderable blocks. A renderable block is the smallest primitive inside the mesh and it contains the vertex & index data, a per-vertex deformable morph target list (position and normal), a reference to a shader and an enum to describe which car part the block belongs to used for destruction when disconnecting parts from the car.
Overall the format is quite simple but specific for just RSC1 needs, it shouldn't have been that hard to reverse engineer. But if they would have asked me I would have given them a detailed description to same them some time :)
Update: Fixed link, stuiped typical mistake