How to import .sldasm file to 3ds max?

For importing Solidworks parts and assemblies you will need nPower installed on 3ds max which have to be purchased.
But there is workaround - use tool from link to export to .obj file with materials (in .mtl file) and import obj file into 3ds max. That should work with all versions.

http://solidsmack.com/wp-content/uploads/2012/04/Free-SolidWorks-OBJ-Exporter-v2.zip

View Uploaded PDF tutorial. Both Solidworks and 3ds Max Applications are required.

I am using Solidworks Premium 2012 and Autodesk 3DS Max 2013 in this tutorial.

I've got 3D Studio Max 2013 and I don't see the import for Solidworks for nowhere. Are you sure ?

Autodesk DirectConnect supports the import of SolidWorks part *.sldprt and assembly *.sldasm files into the Autodesk Alias, Autodesk Maya, Autodesk Showcase, Autodesk Opticore Studio, and 3ds Max/3ds Max Design software.

Import SolidWorks files

Note: Solidworks and Maya should be installed on the same machine in which you are importing

1. Choose the menu path in your installed Autodesk software product:
Autodesk Maya (Windows version) File > Open Scene or File > Import

2.Select a SolidWorks part (*.sldprt) or assembly *.sldasm file. If you cannot see the files, start the SolidWorks software, minimize its window, and then try again to open the files.
3.Click OK, or Open to launch the translator and import the file into the scene.
Note: To maintain the original positioning and orientation of part files in your scene, import the assembly file. Importing part files before the assembly file positions all of them at the origin (0,0,0) and removes the original positioning.

Type of data imported

The software imports NURBS for this file format and maintains the following information on import:

Precise geometric surface and topology information
Data organization
Tolerances and unit
Colors