Can you elaborate on this? It sounds like it would solve my "I can't open two files with the same name" problem too, but I hold down ALT and double-click my second file in explorer and I get the "Properties" dialogue for that file. If I instead hold ALT and click on Excel itself, it opens a new window but it still seems to be linked to the same process (and gives the same error when trying to open the second file of the same name).