Set Adobe Reader as the default PDF handler

windows

Symptoms

PDFs open in Edge or the built-in viewer and you cannot sign them.

Likely cause

Edge/built-in viewers do not support CAC signing.

Fix

Windows 10: 1. Search > 'default'. 2. Default Programs > 'Associate a file type or protocol with a program'. 3. Find .pdf > Change program > Adobe Acrobat Reader. Windows 11: 1. Save the PDF locally. 2. Settings > Apps > Default apps > search '.pdf'. 3. Set Adobe Acrobat Reader.

Sourced from militarycac.com. Rewritten for clarity.

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