Ok, well since you said something about adding custom GameData to the level, I'm gonna post the SOC scripts I have from the MainCFG.
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MainCfg
GameData = lvls.dat
Clear All
*insert level 1 scripts here*
Level 2
LevelName = Green Grove
Act = 1
Music = GFZ1
TypeOfLevel = Singleplayer
NextLevel = 3
SkyNum = 1
RecordAttack = true
LevelSelect = 2
SaveGame = true
SkyboxScale = 64
FlickyList = BlueBird
Emblem 1
Type = Global
Tag = 2
MapNum = 2
Sprite = U
Color = SKINCOLOR_BLUE
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I just typed in what I wanted the GameData file to be named. Also, what do you mean by the game being marked as modified? Hope this helps.