A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
I'd start by changing the FileName:= parameter to the full path to the folder\filename where you want the file to be saved, including the desired extension.
Ie, something like FileName:=sPath & sName & ".PPTX"
Make sure that sPath ends with the correct path separator for Mac and that it has a legitimate value ... in your code example, it doesn't.