Well, this was unexpected. When pointlessly browsing CnC-Source, I found this strange file. Apparently, four years ago, someone refused to upgrade to WinXP and made a patch for Tiberium Wars, and later compatible with Kane's Wrath, to run under Win2000!
So if anyone has a VM with Win2000 on it, this patch may be useful for you.
Xenkan's Windows 2000 Patch for Tiberium Wars/Kane's Wrath (929 KB)