This is a title screen with the Souhoi T-50 prototype. T-50 is a prototype for the stealthy 5th-generation fighter being developed jointly by Russia & India.
x_title.pcx goes to \Civ3\Conquests\Art. Backing up the original (like x_title.original.pcx, as an example) might do good.
To make Civ3 start up with the desktop resolution: add the line Keepres=1 to \Civ3\Conquests\Conquests.ini
This title screen will work with higher resolutions, of course, but there will be black space around the image.
Original photo is here, courtesy of Souhoi Design Bureau.
1280*800 Title Screen: T-50 Taking Off 2016-10-05
1280*800 Title Screen: T-50 Taking Off