Hi
VS can't open an IAR project but it is possible to create a project in VS based on the same files, which then gives better editing, viewing, etc.
The following is the uTasker OpenSource project which can be opened, edited, built in 10 different IDEs (including IAR/VS projects of the same code base)
http://www.utasker.com/forum/index.php?topic=1721.msg7086#msg7086
and the KL03 emulated in approx. real-time in VS to further increased development accuracy and efficiency in comparison to the traditional build/program/test techniques.
I have no guide/document on preparing an IAR project for VS (just some ready-made solutions in the link which are however uTasker project specific).
Regards
Mark