CATPart

CATPart (CATIA Part Description/Model v5) is one of a number of file formats used by the CATIA 3D product design software. It is used in CATIA version 5. The equivalent in version 4 is CATIA V4 Model.

Identification
Files appear to start with the ASCII sequence  (hex bytes 56 35 5F 43 46 56 32).

Sample files

 * One is linked in this question/answer page
 * Another is linked here
 * And another

Other CATIA formats

 * 3DXML - 3DXML format
 * CATDrawing - CATIA V5 Drawing document
 * CATIA V4 Model - CATIA V4 Model / Part Description
 * CATIA V4 Project - CATIA V4 Project
 * CATMaterial - CATIA V5 Material
 * CATProcess - CATIA V5 Manufacturing document
 * CATProduct - CATIA V5 Assembly document
 * cgr - CATIA V5 graphic representation file

Links

 * CATIA site
 * Dassault Systèmes site
 * Okino's CATIA v5 CAD Part & Assembly Importer documentation