Massive's official SDK (Software Development Kit) for Ground Control 2. Since the game is ten years old and finding the SDK is getting harder, I figured I would upload it here. Note that users do need to have their game patched to 1.0.0.8 in order for this kit and any resulting work to function properly.
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Three notes for those new to modding:
Don't put .juice files into your mod sdks. Only the editor can open juices. GC2 can't.
Copy paste the mss32 dll into the data1008 folder - it'll fix the crashing of the GUI editor and give you a graph when you click on the root of a juice file (yeah, that empty white box isn't for show).
The advanced unit types juice is for multiplayer. The other is for singleplayer, but you've already guessed that by now (hopefully).