Oni (folder)/GameDataFolder
The folder with all of Oni's actual game data, as well as the opening and closing cutscenes. The files are grouped into the order in which they are used in-game. The links under the Chapter column go to plot summaries/analyses of each Chapter, and are to be considered spoiler material. The "Level logic folder" column shows which folder has the scripts to power each level, since some of the names in the IGMD folder are less than self-explanatory.
In Windows, Oni expects this folder (commonly called the "GDF" for short) to be in the directory with the executable, but Oni will also look for the GDF in a folder called "OniEngine" off the same directory. Also, if Oni is called from the command line, it will start looking for the GDF in the directories C:\[directory of command that called it]\ and C:\[same]\OniEngine\.
The movie files are not needed for Oni to run; this fact is exploited by some players by moving intro.bik out of the folder (or renaming it) so it won't try to play every time Oni launches.
For information on the workings of the .dat/.raw files in this folder, see here. For information how the level logic scripts work, see here.
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*IGMD\global\ is not present by default, but if it is created, any scripts placed in it will load for all levels; this feature is only supported in Oni for Windows.