If Edge is set as a default app to open PDF files, all your PDF files will be opened in Edge, no matter whether you have installed Adobe PDF Reader or another software on your system.

See what you can do to fix the problem quickly. Adobe Acrobat Reader could not open PDF Earlier, Acrobat products performed no checks on the extraneous bytes present before the %PDF-header.

You can ditch Microsoft Edge and set another app as your default PDF reader, and in this guide, we'll show you how on Windows 10.