If I insert a hyperlink to a Powerpoint document in an Excel spreadsheet, the
powerpoint opens as a slideshow.

There are embedded files within the Powerpoint doc, that I want users to be
able to access. However, when the file runs as a slideshow, these embedded
files are not selectable.

Any clues anyone?

I can't find an option anywhere to switch this behaviour off, could it be
hiding in Powerpoint rather than Excel?