PDF files opening in Edge browser, not Adobe
Some Windows updates reset the default viewer for PDF files to the Edge browser, but it's pretty easy to set it back to Adobe.
Method 1:
Find a PDF on your computer and right-click on it. Hover over Open with and then click on Choose another app.
Ensure that Adobe Acrobat DC is selected. Check the box Always us this app to open .pdf files and then click the OK button.
Method 2:
Find a PDF on your computer and right-click on it, then choose Properties.
Click the Change button on the Properties dialog.
Select Adobe Acrobat DC and then click the OK button.