How to convert DirectX 3d model to FBX

Hi,

I find some cool DirectX 3d models for FPS. I now that Unity do not support DirectX files and I now that is it best practice to have FBX 3d models but this models are so cool and animated so I need them for testing my FPS game. What is best solution to convert DirectX to FBX? It will be great if that solution include blender.

http://www.unwrap3d.com/u3d/index.aspx

This tool converts in many formats and is for me the best.from all that I have tested. Also To mention it has a nice decimator feature

Here (from 7.55 min)it show a reverse route from fbx. to .x ,but it should work in the other way too.

http://www.youtube.com/watch?v=sRLsN5YDWqU&feature=youtu.be&t=7m55s

Thanks, but I see that with demo I can not save. Do I need that option do work with unwrap and 3dMAX plugin? If that option is important can you tell me some free software with can I do conversion. If I can do everything with demo can you explain logical steps how I can do conversion. I never do something like this.