Changed from Adobe to Foxit. GPOs in place to set defaults, including defaultassoc XML file. Defaults are all properly set. Opening a chart > documents > and clicking an attachment to view (PDF file), it opens the aP browser window (blank page) and then opens the document in the Foxit program itself instead of the aP browser window using the Foxit plugin. User are left with 2 windows. Prior to the switch, docs would open and view in the aP browser window (preferred).
Will a PDF open in the browser when you double-click it in File Explorer or does the full Foxit program open? Behavior should be the same as what you want in aP.
It opens in Foxit. Not browser. Prior to removing Adobe, it would open in Adobe, and not the browser. But the AP Browser would display the PDF / chart docs.