blessed

hi i just wondering if anyone can shed some light on this. i made a map on dune and i want to run it but i dont know how to. i have it saved in one of my files and when i click on it. it just says either to search on the internet or to use an existing program and i tries both but i m not really sure what to do, which application to use or what to download. if anyone can help me on this it would be much appreciated thanks.