The Microsoft Edge browser is the default app for PDF files on Windows PCs. However, you can easily change your default PDF viewer to Adobe’s Acrobat Reader DC for files saved to your Windows PC.

Once you've decided on a native or alternative PDF reader to open your file and changed your Windows settings, locate the PDF file in File Explorer. Either double-click the file or right-click the ...

The big difference is that if you want to use the keyboard, there is CMD+o to open files in Mac OS, whereas it's Enter in Windows.