For the longest time I could not find the no-cd resource.cfg file anywhere or what the changes should look like once you copy the CD/ISO contents to the respective CD1-CD4 folders locally.
Hope the below helps.
As always backup original resource.cfg
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MODEL_DATA
data\model
AI_DATA
data\ai
AI_SCRIPTS_DATA
data\ai\scripts
UIDATA
data\ui
AUDIO
data\audio
3DDATA
data\3ddata
MAPS
data\maps
CAMPAIGN_DATA
data\campaign
MISSION_DATA
data\missions
MOVIES
data\movies
MOVIES1
.\cd1
MOVIES2
.\cd2
MOVIES3
.\cd3
MOVIES4
.\cd4
SAVED_GAMES
.\saves
PLAYER_DETAILS
.\details
STRINGS
data\strings
RECORD
data\record
LOGS
logs
SOUNDS
data\sounds
CD1
.\cd1
CD2
.\cd2
CD3
.\cd3
CD4
.\cd4