Thanks for getting back to me so quickly Michael.
It is indeed from the Chrome browser download manager – not trusting the link:
The warning appears when I try to download any of the PDFs by clicking on the save icon. Each save icon has a link like this:
http://www.spc.int/prism/solomons/index.php/sinso-documents?view=download&fileId=11
Whereas if I create a link directly to the PDF then no warning message occurs.
I am unable to upload a screenshot – but you should receive the warning message, when clicking on the link above.
Does this have something to do with permissive file handling?
Many thanks,
James