I'll now give you a guide how to install the game and use the textures (or most of them, the interface textures are buggy).
1.Extract all files from the rar archives to a folder.
2.Mount the Beta image with a program like virtual clone drive or daemon tools.
3. Start the installer that you extracted from the archives.
4. Install the game with the installer
5. Run the patch w3b_103.exe
6. Put the War3BetaCrack.exe into the warcraft 3 beta folder
7. Now you can play it.
8. To use the textures, extract them from the mpq files in the warcraft 3 beta folder, not the setup.mpq from the rar files.
9. do what i tried to describe with the posts above.