I don't belive that those models are included in war3.mpq or war3x.mpq.
To view models using Warcraft 3 Viewer the models must be present on your hard drive either in an mpq file or located seperately elsewhere.
When using Warcraft 3 Viewer simply open the desired model file and select Current File\Show Used Texture Names: the paths will be displayed.
Those files are in the patch.mpq's, like the one called "War3Patch.mpq" i think.
EDIT: nope, winmpq dont work... try this one i know it works:
mpq master