Translated from the help file:
WARCRAFT 2000 was written in 1998. For nine months a group of four people tried to surpass the technical capabilities of WARCRAFT2, STARCRAFT. This version of the game will never be licensed, which is why our office did not try to make a grossing game, we just wanted to improve the good old WARCRAFT2. But nine months is quite a long time. Lack of funding and fading enthusiasm forced us to finish the project at the stage at which you see it.
English 
Comments and reviews
"This version of the game will never be licensed, which is why our office did not try to make a grossing game, we just wanted to improve the good old WARCRAFT2."
So wait a moment they actually tried to make a business out of it? ahahahaha
Blizzard was the most scummy corporation on the planet, the likelihood they would let you sell something based off their property is next to zero. This is the same company that shutdown Starcraft mods based on their own ip and WoW private servers.
".nrj" files are like "iso" created with nero burning rom.
Just look after a freeware like WinCdEmu (install it) and "mount" this file like a CD/disk.
It will be available on your explorer like a new drive.
You could then install it ...
no executable or anything, just an nrg file, which i have no idea what to do with.
This looks stupid!
Great Thanks myabandonware.com
A Ukrainian WarCraft II total conversion mod! Main advantage - no population limit, go nuts with giant armies X)
No comment nor review for this game at the moment.