I frequently download Mac files on my PC at work and they often finish, claiming to be of full size in the download window but obviously undersize and if put on a Mac failing to open if disk images etc etc. I rarely download windows files of any size so I do not know if this happens with them. There is never a reload button or option to select in the download window. A simple solution would be to have an option to download again in the contextual menu. Better would be Firefox, which knows the expected size of the download, to check and flag that it is of an unexpected size. Thanks Lorenzo :-)