To connect to Enders WC3 server download and run http://ender.tog.net/ender.reg, this will add the proper server Info to your registry.
Download and move both w3l.exe and w3lh.dll to your Warcraft 3 Install directory (Most likely "C:\Program Files\Warcraft III\"), then create a shortcut to w3l.exe and place It on your desktop. Use your new shortcut to play on Enders realm.
**Note: To run the Acid! loader In RoC mode, create a shortcut to the loader and add -classic to the target path of your shortcut, eg: "C:\Program Files\Warcraft III\w3l.exe" -classic
Download war3alliso and mount In DaemonTools or Alcohol to play with no-cd.
Link for files:
http://odins.mine.nu/ftpshare/Warcraft3/
Always use the latest version of Warcraft when connecting, currently 1.20c