How to save a 3.5a file in a 3.3 version ?

Hi,

I have created *.mph models with the 3.5a version. For my PhD, I am in collaboration with an other laboratory working with the 3.3 version of COMSOL. But, they can't open my model.

So, how I can convert my model in a 3.3 version ?

I really need your help...

Thanks a lot !

Gabriel.