Looking for help with a basic surfacing question.

Hello all,

Been using Solidworks for awhile now, mostly just basic solid modeling and never messed much with surfacing.

I am slowly starting to explore this part of the program and am looking to build something like the attached, but I'm just completely lost on how it was done. I think this was from one of the members here but I'm not sure. I see in the tree that there was a sketch that was extruded and another sketch that was filled and that appears to be it. I have tried a dozen different ways to do something similar and keep hitting a wall. Are these 3D sketches, regular sketches, are the closed, open?

Id love to have this file just to be able to look at how it was built so I can understand the steps a little better.

Any help at all would be appreciated.

SolidworksParts And Features