How to get the popup box back.

[jerry]

When I download a file I used to get a popup box that asked "What do you 
want to do with this file? Save open.

I checked the box at the bottom of the popup so that it would alway 
select open file. Now I would like to get the popup box back to be able 
to select another option on those occasions.

I cannot find where to reactivate the popup selection box when I 
download a file.

Thanks for any help.

Jerry