*_original.ply - The original mesh
*_segmented.off - Segmented mesh (see note below)
*_abstracted.off - Abstracted mesh, with corresponding segmentation (see note below)
*_stylized_abstracted.ply - Stylized abstracted mesh
*_stylized.ply - Final result (stylized mesh)

Note on segmentation:
Segmented meshes are stored as OFF files. The segmentation is per face and is stored in the face color property of the mesh. A face color of (255,255,255) is out of bounds of the optimisation (so is ignored). A face color of (R,G,B) is a member of cluster with index R+256*G+256*256*B. The stylized meshes have the exact same triangle structure as the non-stylized, hence, the segmentation can be transferred on a per-face basis, if needed.

All files can be viewed with MeshLab: http://meshlab.sourceforge.net/