In every download they tell you the path, whether they want to or not. Just go to the page where you downloaded the model and look for this part (This is the Drider model BTW, all models have an area simular to this)
Model Name: FemaleDrider.mdx
File Name: FemaleDrider.zip
Model Submitted by: garfield
Model uploaded: 11. June 2004
Last modified: 11. June 2004
URL:
http://www.wc3sear.ch/?p=Models&ID=591
Model Name: FemaleDrider
Number of Polys: 549
Number of Skins: 4
Skin 1: units\FemaleDrider\DrowArcher.blp
Skin 2: Textures\star2_32.blp
Skin 3: Textures\gutz.blp
Skin 4: units\undead\cryptfiend\cryptfiend.blp
Animations: 10
Anim 1: Stand
Anim 2: Stand - 3
Anim 3: Death
Anim 4: Attack - 1
Anim 5: Walk
Anim 6: Decay Flesh
Anim 7: Decay Bone
Anim 8: Morph
Anim 9: Stand Alternate
Anim 10: Morph Alternate
Particles: 1
Particle 1: BlizParticle01
Download Counter: 95 times downloaded
Anywho, go to the bit where it says "Number of skins". Any custom skins on the model will be highlighted in yellow. Read their path, and use it when importing the corresponding skin
Now looking at the Raptor's one
Number of Skins: 3
Skin 1: Raptor.blp
Skin 2: grad3.blp
Skin 3: gutz.blp
So you would import the skins to those paths
Pretty easy no?