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 the GaussView main window. If you drag and drop the files with the left mouse button, a separate new molecule group will be created for each file. 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.)