Microsoft Edge definitely acts as a default PDF viewer for the documents but remains as default even when any other PDF reader like Acrobat reader is installed. It means it will automatically open the PDF documents. This newly introduced browser Microsoft Edge is the default PDF viewer as well in system with Windows 10. It is just same as the Internet Explorer comes as a default web browser with earlier versions of Windows 7 or 8. (With Sumatra, it doesn't install the preview handler by default click Options in the installer and select it there.MS Edge comes as a default web browser when you install Windows 10. Others known to work in the viewer pane are Adobe Reader, PDX-Change and Sumatra. Or it could be antivirus blocking the Opus viewer pane/process (docsvw32.exe) from accessing the PDF file itself, which often happens with 'privacy' software that blocks processes that aren't on a whitelist from accessing documents.įailing all else, you could try an alternative PDF viewer. We've seen that explain differences between things working in one program and the other before.

It could also be your antivirus blocking Opus from loading the newer FoxIt DLL, while it didn't object to the older DLL and doesn't mind Explorer loading it. FoxIt installs two handlers (for some reason), so it may be worth trying the other one if their 'XP' one isn't working. That will tell you which PDF preview handler Opus is using.

You can also check under Preferences / Viewer / Plugins, select ActiveX + Preview + Office + Web and click Configure. Reinstalling PDF viewers often fixes problems like this and is the first thing I would try. I can try a newer version if the update that broke things was very recent let me know which version you have. That said, I tried the latest version of FoxIt last week and it was working OK then. If a FoxIt update broke things, you may need to ask them for help. Ever since the last update for Foxit PDF Viewer

Foxit reader pdf view in explorer