Prompted to create new SolidWorks document when importing STEP file.

Whenever I import a STEP file (and maybe other formats; haven't tried) W will prompt me for creating a new part document. It seems as if it does this for every part within the assembly, which can be EXTREMELY time consuming for very large assemblies.  See image below.

I've looked around for a setting so that this doesn't happen (doesn't happen to anyone else in the office), but I can't find anything. Suggestions?

SolidworksImport export