This is an .NET application which simplifies cooking maps for H.I.V.E Mode and for Multiplayer Enhancement Mod mods.
Just unpack it in My Documents/My Games/Gears of War For Windows and make a shortcut to it on desktop.
Firstly you have to open settings window and search for your WarGame-G4WLive.exe to tell application which program use for cooking. Then click ok (those checkbox are not working). Next just pickup map(one at a time but you can add more than one to the list), and click Start Cooking. It may be required to run application in Admin mode.