At the moment, NARS2000 is available as a Windows-based executable only, initially designed to run on Windows 2000, XP, and Vista.
Wine To The Rescue
However that doesn't mean it can't run on other operating systems such as Linux or Mac OS thanks to a translation layer program such as Wine. From the WineHQ website
"Wine is a translation layer (a program loader) capable of running Windows applications on Linux and other POSIX compatible operating systems. Windows programs running in Wine act as native programs would, running without the performance or memory usage penalties of an emulator, with a similar look and feel to other applications on your desktop."
Indeed, NARS2000 has been tested running under Wine on Linux-based systems without a hitch.
NARS2000 has yet to be tested on Mac OS. Although that OS isn't as yet officially supported by the Wine developers, there are instructions for installing Wine and running programs under it.
How To Run NARS2000 Under Wine
To run NARS2000 on your non-Windows operating system, go to the download section of the Wine website and download a binary version of Wine appropriate to your system, install it, download the latest version of NARS2000, unzip it, and run it as