- Right-click the thumbnail of a PDF file, and then choose Properties.
- In the file's Properties dialog box, click Change.
- If you have Acrobat DC or both Acrobat DC and Acrobat Reader DC, choose Adobe Acrobat DC and click OK.
- If you have only Acrobat Reader DC, choose Adobe Acrobat Reader DC and click OK.
- In the Properties dialog box, click OK.
- Now, the PDF files open in Acrobat Reader DC or Acrobat DC.