There are 2 pints in 1 quart, so there will be 3 pints in 1 and 1/2 quarts.
Hi Niki, I understand that Windows Reader is the default Viewer for PDF files. What I was asking was how this was stored in the registry. The key HKEY_CLASSES_ROOT\.pdf key has (Default) = AcroExch.Document (if you have Acrobat Reader installed). In Windows 8 the .pdf key has (Default) =  (blank).
e.g Excel.exe is normally stored in: C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE. but this not absolute because users can change this during installation. Also it can be different for different versions of Office & Windows.