A prototype/preview build (labeled "Preview Code") of Overlord II for Windows, from 2009-04-01 (about two months before the Xbox 360 NTSC release build).
This prototype is the PC/Windows equivalent of the Xbox 360 prototype from 2009-03-29. It includes 17 maps, vs. 30 in the final version of the game.
Playing this prototype requires a SecuROM online activation code, or a modification to the game binary which bypasses that requirement.
There are files in the PREVIEWSCRIPTS folder which imply that it should be possible to skip to other areas by pressing the PC equivalent of A, B, X, Y, or down on the D-pad, but the specific technique necessary to do so is not known at the time of this release.