If you are using FileMaker 11 or older, you can't view the PDF from the container field on a windows machine. You can, however, use a webviewer to open and view the contents of the PDF file and it's URL calculation can extract the filepath needed from a container field where the file was inserted with "store a reference" enabled.
If you are using FileMaker 12, you can use Insert PDF to insert a viewable PDF, but you must first select the container field while in layout mode and use data formatting to optimize the field for interactive content.
I am having difficulty with PDF files in container fields. I formatted the container field to optimize the field for interactive content. When I insert PDF file, the file will not open. I copied and pasted the PDF file and it opens when I go to next record or previous record. It does not allow me to edit the record fields before it opens the PDF. I appreciate any suggestions or thoughts.