File list (Check if you may need any files):
Audio
.....\Inc
.....\...\Audio.h
.....\...\AudioCore.h
.....\...\AudioLibrary.h
.....\...\AudioMixer.h
.....\...\AudioNative.h
.....\...\AudioSubsystem.h
.....\...\AudioTypes.h
.....\...\FormatWAV.h
.....\Src
.....\...\Audio.cpp
.....\...\AudioCoreLinux.cpp
.....\...\AudioLibrary.cpp
.....\...\AudioMixer.cpp
.....\...\AudioPrivate.h
.....\...\AudioSubsystem.cpp
.....\...\FormatWAV.cpp
.....\...\makefile
Core
....\Inc
....\...\afxres.h
....\...\Core.h
....\...\FCodec.h
....\...\FConfigCacheIni.h
....\...\FFeedbackContextAnsi.h
....\...\FFeedbackContextWindows.h
....\...\FFileManagerAnsi.h
....\...\FFileManagerArc.h
....\...\FFileManagerGeneric.h
....\...\FFileManagerLinux.h
....\...\FFileManagerPSX2.h
....\...\FFileManagerPSX2CD.h
....\...\FFileManagerWindows.h
....\...\FMallocAnsi.h
....\...\FMallocDebug.h
....\...\FMallocWindows.h
....\...\FOutputDeviceAnsiError.h
....\...\FOutputDeviceFile.h
....\...\FOutputDeviceNull.h
....\...\FOutputDeviceStdout.h
....\...\FOutputDeviceWindowsError.h
....\...\FRiffChunk.h
....\...\UExporter.h
....\...\UFactory.h
....\...\UnArc.h
....\...\UnBits.h
....\...\UnBuild.h
....\...\UnCache.h
....\...\UnCId.h
....\...\UnClass.h
....\...\UnCoreNative.h
....\...\UnCoreNet.h
....\...\UnCorObj.h
....\...\UnFile.h
....\...\UnGnuG.h
....\...\UnLinker.h
....\...\UnMath.h
....\...\UnMem.h
....\...\UnMsg.h
....\...\UnName.h
....\...\UnNames.h
....\...\UnObjBas.h
....\...\UnObjVer.h
....\...\UnScript.h
....\...\UnStack.h
....\...\UnTemplate.h
....\...\UnType.h
....\...\UnUnix.h
....\...\UnVcWin32.h
....\...\UnVcWn32SSE.h
....\Lib
....\...\Core.lib
D3DDrv
......\Src
......\...\D3DDrv.cpp
......\...\D3DDrv.dsp
......\...\D3DDrv.h
......\...\Direct3D7.cpp
......\...\und3d.cpp
Engine
......\Inc
......\...\AActor.h
......\...\AAmmo.h
......\...\ABrush.h
......\...\ACamera.h
......\...\ACarcass.h
......\...\AGameReplicationInfo.h
......\...\AInventory.h
......\...\ALevelInfo.h
......\...\AMover.h
......\...\APawn.h
......\...\APickup.h
......\...\APlayerPawn.h
......\...\APlayerReplicationInfo.h
......\...\AWeapon.h
......\...\AZoneInfo.h
......\...\ENCVAG.H
......\...\Engine.h
......\...\EngineClasses.h