First open up the MPQ of your choice in a MPQ reading program, i ised MyWarcraftStudio here.
Then find the WMO you want to find all texture paths for, in this case we wanna use Ironfirge. Do not extract the "xxxxx_001.wmo" or "xxxxx_082.wmo" files, that's the acctual models, the file we want is "xxxxx.wmo" in this case "ironforge.wmo" Extract it.
Open up WoWMapEditor, by SWG.
Open the WMO, and bam, you have all the textures listed.