open file .SLDASM in solidworks composer

Hi all

I have a problem that is I open a .SLDASM file in solidworks composer 2017, appearing error as the image attached below. I can not understand why the same product of Dassault Systems SolidWorks Corporation, but it is not compatible, I only open OBJ files.

I look forward to help.

Best regard!

SolidworksComposer