It looks like you are trying to open a file with 3D content but you don't have 3D enabled in Photoshop. The 3D menu sits between Filter and View in the menu bar.
This could be due to you using the "normal" version of CS6 (only CS6 Extended had 3D)
If you do have CS6 Extended version do you have a suitable graphics card to run 3D (posting your system info would help us to help you).
Dave