METAL GEAR SOLID ABSOLUTE CHARACTER MODEL PACK

[Friedslick6]

Well, you could:

• Set up an account on the My 3DVIA website, Upload them to your account privately, and use the official converter to redownload the uploaded .3dxml file as a .dae format.
  
• Use .3dxml format import plugins for common modelling programs, such as Blender's or 3ds Max's.
  
• Open them with Acrobat 3D, right-click on them, select "Export Data..." and save them to a directory in a .igs, .x_t, .stp, .vrml or .stl format.

Starting from any of these methods, you could find ways to indirectly convert .3dxml models into .obj files. Hope that helps you.