You might try just renaming it so that it ends in ".dmg" (make sure there are no spaces at the end as well) -- you'll need to put the first attempted download in the trash first so you can rename the good one. Hope that helps. - Mark > Anticipating moving to iMovie 3, it took me 13 hours to download the > update for OS 10.2 to 10.2.6 (81.6 MB). Now I have a folder on my > desktop labelled "MacOSXUpdateCombo10.2.6.dmg 2" The final "2" just > indicates a second copy (the first aborted). When I try to open the > folder, a message says "There is no default application specfied to > open" the document. "Choose application." I can find no application > that opens it. Can I do anything to get this thing to install? > > BobLL > >