Include a PDF download

@Xara+: you need to perform a clean-up in %localappdata%\Temp\ for PDF documents created as each and every Preview generates a new one and these are not purged.

I do not understand why these are generated with a random xarHHHH.pdf filename (H(3,4): hex 0-F), adrift from the generated output, yet the one "published" is always there as Xara_XPSV17_DDDD\index_htm_files\XaraDocument.pdf.
Combine the two so that Preview accesses Xara_XPSV17_DDDD\index_htm_files\xarHHHH.pdf and actual Export/Publish accesses Xara_XPSV17_DDDD\index_htm_files\XaraDocument.pdf.

Acorn