Directory Opus 12.7 x64 not showing PDF in viewer

When attempting to view pdf in viewerpane I get a code version of the pdf showing. Please see image below.

This happens for ALL pdf not just this one

What PDF viewer do you use? Try reinstalling it.

Adobe Acrobat Reader DC. I will uninstall and redownload/install.

That worked perfect.

Thank you @Jon for your prompt reply.