Having more than one PDF viewer installed can sometimes result in your PDF files opening in your non-preferred PDF viewer. Under the hood of Microsoft Windows the PDF file type becomes associated with a default PDF viewer, so that when you choose to open a file it automatically loads the default PDF viewer.
If your PDF files are opening in a different PDF viewer and you would like them to open in Nitro PDF Professional, please read on. It’s easy to make Nitro Pro the default and tell when another PDF viewer has taken over the default status.
- Open Nitro PDF Professional
- In the top-left, click the Nitro PDF Professional Button
, and then click Nitro PDF Preferences. - In the General settings, turn the top-two checkboxes on:
- Click OK.
That’s it. From now on when you double-click on a PDF file, it will open in Nitro Pro and you’ll also get notified if another PDF viewer takes over the default viewer position.
There’s another very easy way to tell if Nitro PDF Professional is the default viewer: the PDF file type icon. Our Nitro Pro version (see below) is different to the one used by other viewers. When the PDF files on your computer use our icon, it means our viewer is the default.
