Congratulations on being some of the last 0.5% of Windows 2000 users. Sadly supporting really old operating systems is really tough for us developers, since often useful/simple/cool features in newer operating systems aren't supported that far back. And a figure like 0.5% makes it easy enough just to say "we won't do it".
Windows XP is my physical Windows OS. As I prefer running Linux as my main OS, rebooting all the time just to run Construct is something I'm none too keen on doing. And having Linux as a virtual OS under Windows has its own problems - not least of which is VirtualBox not running well with my combo of XP and hardware and screwing up networking.
I only run Virtual!2K to try out old apps on and test compatibility. Really should use XP to do that properly now I guess, but my budget ain't stretching far at all right now.