Agh, re-install of AND still didn't work. I've noticed that other maps that were packaged with RoM and RoM AND do not appear either. Antarctica, North and South America, and the Mars Colonization do not appear among others too. Additionally, I deleted the maps, booted up RoM AND, Alt-tabbed out of the game, and copied the maps into the folder. I brought the game back up and an error came up saying: "Failed to read worldbuilder file,"Earth 12 preset civs,Standard.CivBeyondSwordWBSave".
I'm trying to install the Earth 12 Preset civs and Earth 23 preset civs found in this thread as a download btw. Might try a complete re-install of Civ4 and BTS if no solutions can be found.
Update: Well, a complete re-install of BTS did nothing. There must be something wrong with the WB files. Could I edit any of the WB File with Notepad to make it work? I'm about all of ideas. Not understanding why it works for others but not me. I'll have to give up on it if your file doesn't work 45.