To run the emulator properly you need to download some other stuff before.

In the first step you need to install the SDL runtime library by simply putting the SDL.DLL in the SYSTEM32 folder of your Windows installation.

Furthermore you need the ROM files for BASIC (ATARIBAS.ROM) and the OS (ATARIXL.ROM). You have to put those files in the folder where the A8E program resides.

And finally here's the Windows version of the A8E emulator.
Please read the containing README.TXT file for further instructions!