Function to launch a document from within a QT program written in Javascript

I am using an open source QT based program that uses Javascript functions to add right click mouse menu functionality. I would like you to write a Javascript function that will launch a PDF file using the default PDF viewer of the user's operating system. I will be pulling the file from a Postgres DB, but for this project you can define a local PDF file to launch. Sample of the current Javascript mouse menu code: function populateMenu(pMenu, selected, column) { if ([login to view URL]() == "") { return; } var menuItem1 = [login to view URL](qsTr("View File")); [login to view URL](viewFile); } function viewFile() { var params = new Object; params.wo_id =[login to view URL](); [login to view URL] = "view"; var newdlg = [login to view URL]("myFile", mywindow, [login to view URL], [login to view URL]); [login to view URL]().set(params); }