Is there a best practice procedure for importing AutoCAD 3d solids into Solidworks?

Is it better to export direct from AutoCAd to say *.stp or *.igs and then import into Solidworks. I have used both methods but invariably some parts import in with errors or warnings.

If anyone has any clues or hints it would be appreciated.

I have attached a zipped file of the vendor supplied AutoCAD file for further evaluation.

Usually I do not have too many issues with the import process however this particular file has an issue with a small part (FP-7243-*-677 in Solidworks).

Typically I would simply use the SolidWorks wizard and import direct from the AutoCAD file. The model does import OK however you are left with a warning message that is annoying.

I have also tried the AutoCAD export method to either *stp and *igs, both of these functions work OK.

The issue made me curious and I started to think about how best to overcome the issue and what have other users done to resolve similar issues.

If you have any comments, hints or tips they would be appreciated.