.max and .3ds files crashes unity on mac

Hello,
I and a friend are making a game
He has windows and I have mac.
He donwloaded .3ds and .max files and imported them.
Now if I open a scene where a .3ds or a .max file is located my unity crashes.
Can someone help me?

gr. Cemre

In order to convert .max or .3ds to .fbx Unity needs to have access to a installed version of 3ds Max, but Max does not run on Mac. So that might be the problem.
Try installing 3ds Max on a Windows PC and export your models as .fbx manually.

Hello everyone,
I have found a solution.
In place of 3dsmax you can install autodesk maya.
It works for me
Gr. Cemre