Unity3D 模型導入Error

在導入3d max模型的時候報錯：

3ds Max could not be found.
Make sure that 3ds Max is installed and the max file has 3ds Max as its 'Open with' application!

形成的緣由是由於我直接導入.max文件可是我電腦上面沒有安裝3Dmax.   unity須要導入.fbx才行。