Try this:
Using the Settings app
Open Settings. Click on Apps.
Click on Default apps.
Note: If you're still running the Windows 10 Anniversary Update, the path is Settings > System > Default apps.
Click the Choose default apps by file type link.
Scroll down and find .pdf (PDF File), and click the button on the right side, which is likely to read "Microsoft Edge."
Select your app from the list to set it as the new default.
Click the Switch anyway link to confirm the change.
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