Errors in your registry are one of the common causes for incorrect file associations on your windows system. It is highly recommended that you check your registry for file association errors (will also check for any other registry errors).
The FBX file type is primarily associated with 'Kaydara' by Autodesk, Inc..
FBX is open-standard, platform-independent 3D file format.
Audodesk makes an FBX component for Quicktime to view and interact with these files.
Cannot access FBX files on windows?
When windows gives you an error message saying that it "Cannot open FBX files", this means either:
A. You need to identify a program that can open the file B. Or your registry may be damaged
RECOMMENDED:
In both cases it is strongly recommended that you run a free scan for registry errors.