This will let you open the selected file(s) in the current PMView window, in a new PMView window, or in a slideshow.

Open in Current Window This will open the selected file in the current PMView window. If more than one file is selected, the selected files are loaded into PMView's file sequencer. (Loading the file sequencer with a set of files will restrict the PgUp/PgDn/Home/End keys in the PMView window to work on the selected set of files instead of all files in the directory).

Open in New Window This will open up a new instance of PMView for each selected file.

Open in Slideshow This will create a new slideshow of the selected file(s). If a slideshow is already open, the selected file(s) will be added to the currently open slideshow.