When I installed the latest Windows 10 Update (version 1511, released in November 2015), Microsoft messed it up and changed the default application to open PDF file, they changed it to Microsoft Edge to open PDF files even though my Adobe PDF reader application is still there and was not removed.

Make-PDF-Default

Here’s what you need to do

Go to settings > System > Default Apps > Scroll down to and click on Choose Defaults Apps by File Type > Scroll down all the way until you find .PDF and change it to Adobe Acrobat Reader DC