First install and play with PDF24 on Windows, a couple of simple omissions:
When you right click on a PDF, PDF24 is listed in the menu, however, there is no action shortcuts listed. Clicking on PDF24 only brings up the PDF24 Creator File Tools window without any context/sub-menu.
PDF Viewer/Reader is missing from the PDF24 File Tools listing (although it is included in the PDF24 Toolbox listing).