It's not that I don't trust you, it's that I don't trust you
Is this happening for ALL of your Excel exports, or just this particular one?
For example if you exported say HR.EMPLOYEES or USER_OBJECTS, does 360 still crash?
I'm struggling all day to solve the problem and just ended reinstalling complete office 365.
And, a big surprise, now I can open xlsx files.
So, the conclusion is: don't trust any third-party application.
Sorry for bothering you.