Here is a list of all files with brief descriptions:

include
globals.h	Globals shared between compilation units
main.h	Option flags set from the command line, the configuration file and the registry
wc1.h	Umbrella header for the game core
wc1base.h	Common types, macros and utility prototypes
wc1extern.h	Three prototypes that nothing calls, kept for the exact build
wc1funcs.h	Prototypes of every reconstructed function, in address order
wcdata.h	Game data enumerations and on-disk record layouts
winmain.h	Declarations for the Win32 shell
site
src
ix
dsp.cpp	DirectSound device control and shared configuration
dsps.cpp	Sample stream control
dspv.cpp	Voice control
ix.h	The library's classes and shared declarations
ixfile.cpp	Stdio wrappers used by the streamer and its thread
ixlog.cpp	The diagnostic printer, ix_log_printf
lzo1x.cpp	Hand-written LZO1X decoder for packed streams
mixer.cpp	DirectSound driver opening and the mixer service thread
sample.cpp	Sample objects: AIFF, WAV and raw loading
sound.cpp	Sound objects: initialization, volume, pan, frequency and priority
streamer.cpp	Streamer API and package management
streamfile.cpp	Stream-file methods
system.cpp	Sound-system state and voice allocation
thread.cpp	The streamer's worker thread
auto.c	Autopilot travel and interstitial flight sequences
barracks.c	The barracks: campaign save and load
brains.c	NPC pilot intelligence (the original BRAINS.C)
cmpgn.c	Conversation animation, the briefing, debriefing and office scenes, and campaign mission packet decoding
cockpt.c	Cockpit HUD: weapon, damage, target, objective, message and pilot displays
comm.c	Communication menus and video transmissions
cutscene.c	Scramble, landing and funeral scenes, and the animation demo
damage.c	The cockpit's component-damage display
data.c	Shared initialized data: event queue, cursor and screen geometry, direction-frame tables and cockpit display tables
debug.cpp	The Win32 developer overlay console
dib.c	DirectDraw back end: frame buffer, palette and screen updates
disk.c	Data files and packet fetching with retries, text-font setup and input waits
eject.c	Ejection and stranded-pilot sequences
ending.c	Campaign victory, retreat and ending scenes
eventmgr.c	Event manager, mouse pointer and frame timer
fade.c	Incremental palette transitions, and the DOS string-append shim beside them
fl.c	Flight manoeuvre handlers and their dispatch
game.c	Shared game state, mission and manoeuvre tables, and the information display
gameflow.c	Campaign flow and mission scoring
geom.c	Vector, angle and fixed-point geometry, and ship speed and fuel limits
gr.c	Rasteriser primitives, screen-space effects and the music streamer's wrappers
init.c	Game startup, graphics defaults and Origin FX initialization
input.c	Joystick transitions and menu input polling
install.c	Installation-file loading, start-up arguments and disk-prompt setup
joycal.c	Joystick calibration and graphics setup data
joystick.c	Interactive joystick calibration and button waits
killbrd.c	The bar, the kill board, conversation scenes and the initial campaign state
launch.c	Carrier departure and cockpit launch sequences
logic.c	Ship mission logic, resource ownership and scene animation
main.c	WINGLEADER's main module: process services, flight control and the HUD
mathfp.c	Random numbers, fixed-point arithmetic and trigonometry computed in floating point, and text-cursor and shape-frame helpers
mathutil.c	Integer min and max, a packet-release helper, and the single-precision angular constants
mission.c	Mission setup, ship resources, formation placement and pilot speech
mono.c	Data-file wrappers, scaled interstitial text, canned sequences and the MONODEBG.VXD developer console
music.c	Music state machine and the streaming music script
nav.c	Navigation map, objective labels and the in-flight computer
nearheap.c	Near-heap descriptor allocation and compaction carried over from DOS
objdata.c	Object definitions, animation streams and weapon display coordinates
pilot.cpp	Inter-scene transitions, answer prompts, and the developer console's instance and wrappers
pload.c	The packet loader
screen.c	Mission requests, viewport setup and packet-memory management
screens.c	Briefing, debriefing, medal and funeral screens, and the conversation scene director
select.c	Gun and missile selection
ship.c	Ships: damage, explosions and weapons
smart.c	Collision avoidance, formation flying and manoeuvre selection
sound.c	Sound-effect samples, playback and saved volume settings
spc.c	Space-object simulation and the fleet overview camera
strdos.c	16-bit DOS C string and memory shims, and the event manager's set-up entries
targ.c	Objective arrival, warp transitions, mines and cockpit cleanup
timer.c	Win32 frame timer and developer step waiting
title.c	Opening cinematic, credits and title menu
trainsim.c	Training simulator: menus, pilot name entry, high scores and the mission loop
version.c	The game's version string
video.c	Video resource shutdown and palette allocation
view.c	Scripted views, constellation effects and cockpit target rendering
winmain.c	Win32 shell (window creation, message loop, exit paths and the guarded debug allocator) and the asteroid and mine hazard fields
winsys.c	Win32 system services: mouse, keyboard and clock wrappers, font workspaces, CD-ROM location and disc-swap prompts