I have made some thumbnails which I placed in the texture folders:
http://download.codelegend.com/other/MV-KA350i_thumbnail.zip
Unzip and copy the files to the four folders, one in each corresponding to the tail number:
For example, copy "N70EU_thumbnail.jpg" into:
C:\Program Files\Lockheed Martin\Prepar3D v4\SimObjects\Airplanes\MV_King_Air_350i\Texture.N70EU\
then rename to
"thumbnail.jpg"
by removing the first part of the name including the underscore.
So then IF will display the aircraft thumbnail instead of the question mark that IF shows for missing thumbnails.