Does Inkscape open Illustrator files correctly?

My designer friend sent me mockups created in Illustrator (.ai files).

I opened them with Inkscape

For every file, Inkscape prompts me to import from PDF (is that normal?)

The mockups display in Inkscape 1200px wide - but the designer told me today the site is 960px wide.

Could Inkscape be opening the files incorrectly?

Or could it be somthing wrong with the preparation?

I'm not looking to point fingers -

I told her in the future send me psd or flat images.