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These are a series of registry keys used by various iterations of the Halo engine and its tools. Registry keys ending with a trailing slash indicates that it is a key (and the value is the (Default) value within it), and any that end without it is a value.

Game\f0c1

Tools Directory\f0c1

[REG_BINARY] HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Halo 2\tools_directory

Map set (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Map Set

Audio Settings\f0c1

Whether or not to enable the low-pass filter (?)\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Audio Settings\LowPassEnable

Limit of mono sounds (?)\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Audio Settings\MonoCount

Whether or not to enable reverb\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Audio Settings\ReverbEnable

The speaker configuration selected\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Audio Settings\SpeakerConfig

The number of stereo speakers\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Audio Settings\StereoCount

The volume of sound\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Audio Settings\Volume

Video Settings\f0c1

Whether or not to use anti-aliasing\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\AntiAliasing

The specified aspect ratio\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\AspectRatio

The brightness of the game\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\Brightness

The display mode of the game (?)\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\DisplayMode

The gamma of the game\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\Gamma

The size of the in-game HUD\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\HudSize

The level of detail (LOD) to use\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\LevelOfDetail

The screen safe area\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\SafeArea

The screen refresh rate\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\ScreenRefresh

The screen resolution's X value\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\ScreenResX

The screen resolution's Y value\f0c1

HKEY_CURRENT_USER\Software\Microsoft\Halo 2\Video Settings\ScreenResY

Guerilla\f0c1

Recent files\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\guerilla\Guerilla\Recent File List\File1 [REG_SZ] HKEY_CURRENT_USER\Software\bungie\guerilla\Guerilla\Recent File List\File2 [REG_SZ] HKEY_CURRENT_USER\Software\bungie\guerilla\Guerilla\Recent File List\File3 [REG_SZ] HKEY_CURRENT_USER\Software\bungie\guerilla\Guerilla\Recent File List\File4

Settings (unused?)\f0c1

[REG_KEY] HKEY_CURRENT_USER\Software\bungie\guerilla\Guerilla\Settings

Sapien\f0c1

Settings\f0c1

Whether or not to enable automatic backup\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\autobackup_enable

How often (in minutes) to create a new backup\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\autobackup_interval

How many backups should be stored at a time\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\autobackup_limit

Whether or not to limit the number of automatic backups\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\autobackup_use_limit

Whether or not to use the user-provided backup path\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\autobackup_use_path

Who the hell knows. (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\blah

Whether or not to create a config for tool.exe (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\create_tool_config

The size and position of the hierarchy window (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\hierarchy_window_rect

Unknown (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\main_window_frame

The size and position of the main window (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\main_window_rect

The size and position of the options window (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\options_window_rect

The size and position of the output window (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\output_window_rect

The size and position of the properties window (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\property_window_rect

The size and position of the hierarchy window (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\sapien_loading_window_rect

Something to do with some sort of list size (and position?) (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\type_list_rect

The size and position of the warnings window (?)\f0c1

[REG_BINARY] HKEY_CURRENT_USER\Software\bungie\sapien\warnings_window_rect

Auto backup path\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\autobackup_path(Default)

Last directory (unsure if this is last level or just the most recent folder to open)\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\

Class types (all of these are blank - the value is set, just set to absolutely nothing)\f0c1

Biped directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\biped directory

Crate directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\crate directory

Creature Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\creature directory

Decal directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\decal directory

Decorator Set Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\decorator_set directory

Detail Object Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\detail_object directory

Device Control directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\device_control directory

Device Light Fixture\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\device_light_fixture directory

Device Machine Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\device_machine directory

Equipment Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\equipment directory

Light Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\light directory

Scenery Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\scenery directory

Sound Scenery Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\sound_scenery directory

Vehicle Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\vehicle directory

Weapon Directory\f0c1

[REG_SZ] HKEY_CURRENT_USER\Software\bungie\sapien\weapon directory