Hi,
I bought Modeler but I still don't use it.
But I tried to reproduce your problem. Unfortunately I do not find any option to import .FBX files.
Modeler import menu seems to support .DXF .LWO .OBJ .6KT and .6KH formats only.
(.OBJ format can be imported and it works.)
How did you import a .FBX in the Japanese version?
Hey man thanks a lot for your answer.
Well, let me show you some screenshots and then you can see the mistake. In my case I don´t use Modeler for doing modeling, I´m using Coordinate which is integrated inside Modeler.
The first Screenshot you can see how I can choose Coordinate Option when I´m opening Modeler. (You can see everything in Japanese because is the only way I can import my FBX Files)

The second Screenshot you can see the new Coordinate Interface. So I´m clicking into the Body Icon and just below you see the folder which I can import any FBX, LWO, 6KT...

The third that´s the files extensions


So the problem on your translation version when I click on this folder I can´t find any file in my browser and if I want to drag my fbx file into the interface, it doesn´t appear anything. Is like the software was damaged. I tried to reinstall between 4 times and also I installed it in another PC and always is the same trouble.
Just put any FBX file into your Browser, Desktop, wherever you want and then try to find it or drag it on.
So I hope you could to solve this trouble because in Japanese version it works.
Cheers.