If you create a linklist and add a link to an image (DMS), then the resulting link will end with .html, e.g. http://dev.magnolia-cms.com/magnolia-me-demo/dms/demoImg/dummy-460_sec1_art1.html . When downloading the actual filename (with Safari at least) will add a .jpeg, in the above example the filename would become dummy-460_sec1_art1.html.jpeg

I think it should not add .html if it is not an HTML page we link to.