The grand solution
EDIT FOUR: Hopefully, solving your problem. Create a directory called Warcraft III Folder - wait, before further stuff, what files do you have?
You can read this one, but its older and doesn't help your I have no War3 folder thing.
EDIT 2: Ok, heres the steps you'll follow. Create a folder called Maps in your WarCraft III directory. Create three folders in it - Download, FrozenThrone, and Scenario. Create a folder in FrozenThrone called Scenario. Done, you have all folders of an average non-map maker. EDIT 3 IT IS ACTUALLY. END EDIT
What the hell? Ok, I'll show you what most of my Warcraft III directory looks like.
FOLDER - A.I SCRIPTS - Standard, GruntMaster.wai, WyrmMonger.wai.
Battle.net Cache
Blizzard Support
BNUpdate
BNUpdate.app
bnupdate.log
Campaigns
Errors
icons-WAR3.bni
License.txt
LicenseUK.txt [I didn't buy this from U.K nor am I from U.K]
Maps - Ok lets stop here and just look at maps [did you call your folder Maps or maps?]. Now, the folder that should be in here is - Test, if you've tested map from WE, Frozen Throne, Download and Scenario. There should be melee maps with the extension w3m in here, [I know you don't have them]. Frozen Throne should have melee with extension w3x, and one folder - Scenario. I'll load an attachment which is the maps folder - my editor maps/downloaded maps over b.net etc.
EDIT: Ugh, 40 mb with half of it removed. Lol I had 5 gb of maps once.
EDIT 2: Ok, heres the steps you'll follow. Create a folder called Maps in your WarCraft III directory. Create three folders in it - Download, FrozenThrone, and Scenario. Create a folder in FrozenThrone called Scenario. Done, you have all folders of an average non-map maker.