Change the default PDF Viewer in Windows 10

​When Microsoft Edge is set as your default browser, your PDF viewer will also default to Microsoft Edge. If you would like to change the default application associated with a file type, follow these steps:

  1. Go to Settings > System > Default apps
  2. Scroll to the end of the dialog
  3. Select “Choose default apps by file type
  4. Scroll to the .pdf file type listed on the left
  5. Left click on the associated item to the right of the file type
  6. Select the default app you want to use for opening .pdf files