In 2008 I made a
tutorial in a German civ site about the kind of search paths you are using in your mod for including units, that are only in the conquests and not in the normal Civ3 unit pool. Here is the example with the musketman of the Napoleonic Europe conquest for a mod/scenario in the Civ 3 Content folder:
[Speed]
Normal Speed=225
Fast Speed=225
[Animations]
BLANK=
DEFAULT=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantryDefault.flc
WALK=
RUN=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantryRun.flc
ATTACK1=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantryAttack.flc
ATTACK2=
ATTACK3=
DEFEND=
DEATH=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantryDeath.flc
DEAD=
FORTIFY=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantryFortify.flc
FORTIFYHOLD=
FIDGET=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantryFidget.flc
VICTORY=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantryVictory.flc
TURNLEFT=
TURNRIGHT=
BUILD=
ROAD=
MINE=
IRRIGATE=
FORTRESS=
CAPTURE=
STOP_AT_LAST_FRAME=
[Timing]
BLANK=0.500000
DEFAULT=0.500000
WALK=0.500000
RUN=0.500000
ATTACK1=0.500000
ATTACK2=0.500000
ATTACK3=0.500000
DEFEND=0.500000
DEATH=0.500000
DEAD=0.500000
FORTIFY=0.500000
FORTIFYHOLD=0.500000
FIDGET=0.500000
VICTORY=0.500000
TURNLEFT=0.500000
TURNRIGHT=0.500000
BUILD=0.500000
ROAD=0.500000
MINE=0.500000
IRRIGATE=0.500000
FORTRESS=0.500000
CAPTURE=0.500000
STOP_AT_LAST_FRAME=0.500000
[Sound Effects]
BLANK=
DEFAULT=
WALK=
RUN=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantRun.amb
ATTACK1=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantAttk.amb
ATTACK2=
ATTACK3=
DEFEND=
DEATH=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantDeath.wav
DEAD=
FORTIFY=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantFortify.wav
FORTIFYHOLD=
FIDGET=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantFidget.wav
VICTORY=..\..\..\..\..\Conquests\Napoleonic Europe\Art\Units\Musketman\NapoleonicInfantVictory.wav
TURNRIGHT=
BUILD=
ROAD=
MINE=
IRRIGATE=
FORTRESS=
CAPTURE=
TURNLEFT=
STOP_AT_LAST_FRAME=
[Version]
VERSION=1
[Palette]
PALETTE=
Please note, that this tutorial was done before Civ 3 Complete appeared. May be with Civ 3 Complete there are easier paths for including such a unit in a C3C mod/scenario.