So confused right now. I've followed this guide :60 seconds guide to getting your game to run in DOSBox

I have DOSbox installed and my games file is in a folder called C:\ECO. I followed the guide exactly as it states - it's the 60 second guide to DOSbox. Everything was going fine - mounted the C and D drives, the game is installed onto my computer and I did C:, and then dir
It now says:

Directory of C:\.
. <DIR> 11-05-2006 14:06
.. <DIR> 01-01-1980 00:00
ECO1~1 EXE 498,480 13-03-1995 13:16
1 file(s) 498,480 bytes
2 dir(s) 110,540,880 bytes free

Now I don't know what to do. I typed in ECO1~1 and it says This program requires Microsoft Windows. I am running windows XP. What do I need to do???

Thanks so much for any help!

Em