Please describe what you want. In Windows Explorer or Mac Finder you can duplicate the file. Then you can open the file.
When i download a pdf file from a webside, it is opening directly. And
i save it manually.
I want : When i click on the file and starting to download i want it to ask me save or open before.
You can always right click on the link to the file and choose to save it.
I access a goverment site and most of goverment sites in Turkey do not allow us to right click. As i remember an old verion of acrobat reader was doing this.