IS2-- What folder do I place scenery objects?

Hello:

FSX-P2-A

There seems to be no correlation between the FSX IS2 menu and the IS2 default installed thumb.

What do I need to do to install downloaded scenery objects and thumbnails so IS2 can read them?

Is their a EZer way to see the placement of objects and associated thumbnails?

Do I need "RW12" scenery objects or is there a replacement?

Apparently RW12 is in a different format than most scenery objects.

Thanks.

GDR1944