1 ) EN 1 knows if there is a way to convert from Blender to Catia V5 and vice versa 
2 ) EN 1 has the home address URL for Catia software
Tanks & Salutations
Dassault Systemes
You can try WRL or STL format for data interchange with CATIA. If it works let me know as I have been planning to try it. I have access to a lot of CATIA models.
Thx.