Here are the classes, structs, unions and interfaces with brief descriptions:

ActiveWindow
Asteroid
AudDlg
AudioConfig
Authorization
AutoThreadSync
AviFile
AwardDlg
AwardInfo
AwardShowDlg
AWEvent
AWMap
BaseScreen
Bitmap
BlockReader
BmpFileHeader
BmpImage
BmpInfoHeader
Bolt
Button
CAboutDlg
Callsign
Camera
CameraDirector
CameraView
Campaign
CampaignMissionFighter
CampaignMissionRequest
CampaignMissionStarship
CampaignPlan
CampaignPlanAssignment
CampaignPlanEvent
CampaignPlanMission
CampaignPlanMovement
CampaignPlanStrategic
CampaignSaveGame
CampaignSituationReport
CarrierAI
Chunk
CmdDlg
CmdForceDlg
CmdIntelDlg
CmdMissionsDlg
CmdMsgDlg
CmdOrdersDlg
CmdTheaterDlg
CmdTitleDlg
CmpCompleteDlg
CmpFileDlg
CmpLoadDlg
CmpnScreen
CmpSceneDlg
CmpSelectDlg
Color
ColorFormat
ColorIndex
ColorValue
ColumnDef
CombatAction
CombatActionReq
Combatant
CombatAssignment
CombatEvent
CombatGroup
CombatRoster
CombatUnit
CombatZone
ComboBox
ComboList
Command
Component
ComponentDesign
Computer
ConfirmDlg
ConsoleReader
Contact
ContentBundle
CreatePolyCommand
CtlDlg
CtrlDef
D3DXImage
DataArchive
DataEntry
DataHeader
DataLoader
DebriefDlg
Debris
DetailSet
Dictionary
DictionaryCell
DictionaryIter
Director
DisplayElement
DisplayView
Drive
DrivePort
DriveSprite
Drone
DropShipAI
Dust
EditBox
EditCommand
Editor
Element
Encryption
EngDlg
EventDispatch
EventTarget
ExceptionHandler
ExitDlg
Explosion
FadeView
Farcaster
FighterAI
FighterTacticalAI
FileReader
FirstTimeDlg
fix
FlightComp
FlightDeck
FlightDeckSlot
FlightPlanner
FltDlg
Font
FontChar
FontItem
FontKernData
FontMgr
FormDef
FormWindow
Galaxy
Game
GameScreen
Graphic
Grid
GridProps
GroundAI
Hangar
HangarSlot
HardPoint
HomogenousPlane
Hoop
HttpClient
HttpParam
HttpRequest
HttpResponse
HttpServer
HttpServlet
HttpServletExec
HttpSession
HttpTestServlet
HUDSounds
HUDText
HUDView
ImageBox
ImgView
InboundSlot
Insets
Instruction
Intel
JoyDlg
Joystick
Keyboard
KeyDlg
KeyMap
KeyMapEntry
KeyName
L3DS
LandingGear
Layout
LayoutDef
LChunk
LColor3
Light
LImporter
List
ListBox
ListBoxCell
ListBoxColumn
ListBoxItem
ListIter
LLight
LMap
LMaterial
LMatrix4
LMesh
LoadDlg
LoadScreen
LObject
Locale
LTri
LTriangle
LTriangle2
LVector2
LVector3
LVector4
MachineInfo
Magic
MagicDoc
MagicView
MainFrame
MapView
Material
Material3DS
MaterialDialog
MaterialMag6
Matrix
Memory
Menu
MenuDlg
MenuHistory
MenuItem
MenuScreen
MenuView
Mesh3DS
MFD
Mission
MissionAlias
MissionCallsign
MissionElement
MissionEvent
MissionInfo
MissionLoad
MissionShip
MissionTemplate
ModCampaign
ModCatalog
ModConfig
ModDlg
Model
ModelFile
ModelFile3DS
ModelFileMAG
ModelFileOBJ
ModelView
ModInfo
ModInfoDlg
MotionController
Mouse
MouseController
MsnDlg
MsnEditDlg
MsnEditNavDlg
MsnElemDlg
MsnEventDlg
MsnNavDlg
MsnObjDlg
MsnPkgDlg
MsnSelectDlg
MsnWepDlg
MultiController
MusicDirector
MusicTrack
NavAI
NavDlg
NavLight
NavSystem
NetAddr
NetAddrDlg
NetAdminBanUser
NetAdminChat
NetAdminFile
NetAdminLogin
NetAdminServer
NetAdminServerMgr
NetAdminServlet
NetAdminUserList
NetAuth
NetBrokerClient
NetCampaignInfo
NetChatEntry
NetChatMsg
NetClient
NetClientConfig
NetClientDlg
NetCommMsg
NetData
NetDisconnect
NetElemCreate
NetElemRequest
NetFileServlet
NetGame
NetGameClient
NetGameServer
NetGram
NetHost
NetJoinAnnounce
NetJoinRequest
NetLayer
NetLink
NetLobby
NetLobbyClient
NetLobbyDlg
NetLobbyParam
NetLobbyServer
NetMsg
NetMsgMultipart
NetNavData
NetNavDelete
NetObjDamage
NetObjEmcon
NetObjHyper
NetObjKill
NetObjLoc
NetObjTarget
NetPacket
NetPassDlg
NetPeer
NetPlayer
NetQuitAnnounce
NetSelfDestruct
NetServer
NetServerConfig
NetServerDlg
NetServerInfo
NetShipLaunch
NetSock
NetSysDamage
NetSysStatus
NetUnitDlg
NetUnitEntry
NetUser
NetUtil
NetWebServlet
NetWepDestroy
NetWepRelease
NetWepTrigger
Object3DS
ObjFace
OPCODE_data
OptDlg
Orbital
OrbitalBody
OrbitalRegion
PacketAssembly
Parser
Particles
PcxHeader
PcxImage
Physical
Plane
PlanetRep
PlanScreen
Player
PlayerDlg
PngImage
PngIOStruct
Point
Poly
PoolItem
PowerSource
Projector
QuantumDrive
QuantumFlash
QuantumView
Quaternion
QuitView
RadioHandler
RadioMessage
RadioTraffic
RadioView
RadioVox
RadioVoxController
Reader
Rect
RenderStats
Resource
RichTextBox
RLoc
Scanner
Scene
Screen
ScrollWindow
SeekerAI
Segment
Selection
Selector
Sensor
SHA1
Shadow
Shield
ShieldHit
ShieldRep
Ship
ShipAI
ShipCatalogEntry
ShipCtrl
ShipDebris
ShipDesign
ShipExplosion
ShipKiller
ShipLoad
ShipSolid
ShipSquadron
ShipStats
Shot
Sim
SimEvent
SimHyper
SimObject
SimObserver
SimRegion
SimSplash
Skin
SkinCell
Slider
Solid
Sound
SoundCard
SoundCardD3D
SoundCheck
SoundD3D
Sprite
Star
Stars
StarServer
Starshatter
StarshipAI
StarshipTacticalAI
StarSystem
Steer
SteerAI
Surface
SurfacePropertiesDialog
System
SystemDesign
TacRefDlg
TacticalAI
TacticalView
tagTrackIRData
tagTrackIRSignature
TargetOffset
TemplateList
Term
TermArray
TermBool
TermDef
TermNumber
TermStruct
TermText
Terrain
TerrainApron
TerrainClouds
TerrainHaze
TerrainLayer
TerrainPatch
TerrainRegion
TexCacheDX9
TexCacheDX9Entry
TexCubeDX9
Text
TextRep
TextureMap
TextureMapDialog
ThreadSync
Thruster
ThrusterPort
Token
TrackIR
Trail
Triangle
Triangle2
Universe
UVMapView
Vec2
Vec3
Vec3B
VertexSet
VidDlg
Video
VideoDeviceInfo
VideoDX9
VideoDX9AdapterInfo
VideoDX9DetailVertex
VideoDX9DeviceCombo
VideoDX9DeviceInfo
VideoDX9DisplayMode
VideoDX9Enum
VideoDX9FormatConflict
VideoDX9IndexBuffer
VideoDX9LineVertex
VideoDX9LuminousVertex
VideoDX9NormalVertex
VideoDX9ScreenVertex
VideoDX9SegmentData
VideoDX9SolidVertex
VideoDX9SurfaceData
VideoDX9VertexBuffer
VideoFactory
VideoMode
VideoPrivateData
VideoSettings
View
Water
WATER_REFRACT
WATER_SURFACE
WAVE_DATA
WAVE_FACT
WAVE_FMT
WAVE_HEADER
Weapon
WeaponDesign
WeaponGroup
Weather
WebBrowser
WepGroup
WepView
WinDef
Window
WinPlot
ZoneForce