I followed this guide
installed Foxit reader on my Windows server 2019 RDS host. published it as RemoteApp, enabled PDF file association in it. on another Windows server 2019 (my AD DC and i used it as client for test) i used the RemoteApp feed URL and entered it in the control panel, it then successfully added RemoteApps to the start menu but the PDF files still open by Microsoft Edge. file association doesn't not work.
how can i fix this?