I am not sure I totally understand. But I checked and I do (now if not before) have a default app set for PDF files.
So now, I am running as Administrator, (which I believe I am all the time), I should get the default viewer?
If for some reason I am NOT logged in as Administrator, I am not sure if I will get PDFArchitect or my default PDF Viewer.
What would the action be if I were logged on as Administrator and I had no default PDF viewer? I am thinking that I would get PDFArchitect. This may be what was happening but I did just check now and I do have a default set. Perhaps I installed a new PDF reader and it set the default for me as I do not remember doing so.
I will run some test and leave with thanking you for your help … Thank You!