I've only been playing vs AI and I'm getting ready to go online and play multi.  I haven't played many of the maps at all -- is there any way to preview the layout of all of them?

I downloaded Galaxy Forge for this reason, but none of the official maps' .galaxy files appear in the Open dialog.

An older thread commented on that specific issue but none of the fixes in it worked.  Do I basically have to start a comp stomp on every map and explore completely to see what they all look like?  THanks.