You might want to look at these:
C:\Program Files (x86)\Steam\SteamApps\common\Sid Meier's Civilization V\Assets\DLC\Shared\UI\Art\LoadingImage\LoadingBaseGame_zh_Hant_HK.dds
C:\Program Files (x86)\Steam\SteamApps\common\Sid Meier's Civilization V\Assets\DLC\Expansion\UI\Art\LoadingImages\Loading_zh_Hant_HK.dds
C:\Program Files (x86)\Steam\SteamApps\common\Sid Meier's Civilization V\Assets\DLC\Expansion2\UI\Art\LoadingImages\Loading_zh_Hant_HK.dds
They are the logos the game uses when you first open the game. You'll might need find a viewer for .DDS files to actually see these. The good thing about DDS format, it retains the "blank" alpha channel, so you can easily paste the image on top of another image, and still retain all the shadowing around the letters of the logo.