xxx_map.ini

xxx_map.ini (where xxx is the name of the map)

[General]
GDIWinBanner=HUD_GDIWINBAN (w3d file to use for the GDI win banner, no .w3d on the end)
NodWinBanner=HUD_NODWINBAN (w3d file to use for the Nod win banner, no .w3d on the end)
LoadingMusic=filename
OverrideNightTime=bool (set this to true to cause it to be night time no matter what the actual time is set to)

[CustomBackdrop]

Works just like campaign.ini backdrop settings (documentation on how this works needed)

; You can specify a 'color' in two ways:

; 1. Separate Red/Green/Blue components:

;    SkyColorRed=112

;    SkyColorGreen=146

;    SkyColorBlue=176

; 2. Hex color (ARGB):

;    SkyColorHex = 0xFF7092b0

[SkyColors]
OverrideSkyColors=bool (enable this to override the sky colors)
WarmSkyColor=color (Warm sky color - Clouded sky's additional, color around the sun)
ColdSkyColor=color (Cold sky colors - Clouded sky's additional color everywhere else + Fog color (bottom skydome))
SunColor=color (Sun color)
SunHaloColor=color (Sun halo color)
MoonHaloColor=color (Moon halo color)
SkyColor=color (Sky color (top skydome))
GloominessColor=color (Cloud gloominess color)
StarfieldAlpha=int (Star field transparency, 255 - Stars appear (good for clear sky night time); 0 - No stars)

; These are the defaults.

Textures for sky settings:
[SkyTextures]
StarTexture=Star.tga
LightningTexture=LightningBolt.tga
LightningSource=LightningSource.tga
SunTexture=Sun.tga
SunHaloTexture=SunHalo.tga
MoonHaloTexture=MoonHalo.tga
CloudTexture=CloudLayer.tga
MoonTexture1=FullMoon.tga
MoonTexture2=PartMoon.tga
EarthTexture1=FullEarth.tga
EarthTexture2=PartEarth.tga

Thunder sounds
[ThunderSounds]
ThunderSound1=Thunder01
ThunderSound2=Thunder02
ThunderSound3=Thunder03
ThunderSound4=Thunder04
ThunderSound5=Thunder05
ThunderSound6=Thunder06
WarBlitzSound=SFX.Ambient_Explosion_01

Weather textures
[WeatherTextures]
WeatherTexture=WeatherParticles.tga

Weather sounds
[WeatherSounds]
WindSound=Wind01
RainSound=Rainfall01

All sounds set in this ini file are sound preset names and should work as twiddlers. Although the sounds are loaded once when the level is loaded or the weather settings get changed by e.g. a script command (at least for the thunder, wind and rain sounds, war blitz sound is weird and I don't fully understand that one)