Google Chrome used to open PDFs downloaded to the hard drive using the system's default PDF viewer by default. Recent versions of Chrome use Chrome's (inferior) built-in PDF viewer by default even for downloaded files, not only online PDFs.
How can I get Chrome to open downloaded PDFs using the system's viewer by default?
This question refers to downloaded PDFs only, I want to keep using the Chrome viewer for online PDFs.
Clicking this button on the download bar above, choosing "Open", or checking the "Always Open Files of This Type" option should invoke the system viewer, not Chrome. How can this be achieved?