PB

PB (packed model) is the model format used by Atlus in  Shin Megami Tensei III: Nocturne, the Digital Devil Saga  duology and the  Raidou Kuzunoha  games. Along with PB you may also find some other model formats, such as:


 * MB - model format, unlike PB it is unpacked
 * AB - animation format, some models have it unpacked, usually in the same folder as MB model
 * TB - textures format container, has TMX textures inside it

PB 3DS MAX importer
TGE created a maxscript that's intended to be used with Autodesk 3DS MAX. It supports importing PB, MB meshes, rigging, materials. You can get it here. Skinning or texturing information may not always be perfectly retained and models may require manual tweaking.

DDS3-Model-Studio
DDS3-Model-Studio (or DDS3ModelConverter) is a tool for converting skinned models to formats such as DAE, OBJ, FBX. Rigging and mesh/texture conversion is currently possible. You can download the latest build here or get a version that includes DniweTamp's windows .bat script for mass converting of PB and MB models to all three formats, DAE, OBJ and FBX, here.