A pdf file can be embedded into a work sheet by the Insert/Object menu.
When the icon/control so produced is clicked the file opens with Acrobat
Reader which is fine.
There seems to be no way to prevent the user from moving or even removing
the link.

The file could also be opened with a hyperlink but that means the user has
to ensure the file is maintained in a standard place.

Is there a solution that is user proof?

TIA
Henry