On a Windows system, you can open one or more files in GaussView by dragging them from a Windows explorer window or other Windows location and dropping them onto a GaussView view window. If you drag and drop the files with the left mouse button, the files will be added to the view window's molecule group. If you you drag and drop the files with the right mouse button, you get a menu of options when you drop of how you want the files to be opened (e.g, create a separate new molecule group for each file, create a single new molecule group for all files, etc.)