Directory Opus opens PDF Files in Microsoft Edge instead of default PDF viewer

Sorry, this may as well be user error, but this has me completely stumped:

Windows 11 24H2, Directory Opus 13.10

Swiftdo PDF is my PDF Viewer/editor of choice at the moment. It's set as the default App for .PDF files in Windows 11.

Opening PDF files from the Windows Explorer (or Windows Desktop or pretty much anywhere else) opens them in Swiftdo PDF.

Double-clicking the same PDF file from Directory Opus 13.10 opens them in Microsoft Edge. Every single time. What am I doing wrong?

Try right-click > Open With > Choose Default and select it from there. That sometimes fixes similar issues.

If it still opens Edge, there might be something in Settings > File Types that's overriding the double-click action. A script add-in could also do the same, potentially.

(I assume we're talking about the PDF opening in a new window/program, not within the viewer pane of Opus.)

Try right-click > Open With > Choose Default and select it from there. That sometimes fixes similar issues.

First thing I did. Changed the default multiple times. Works for every other app, except Directory Opus. (Oh, and when the file is opened via that dialog, it opens in the correct app - but the "Open" dialog still insists on Edge).

A script add-in could also do the same, potentially.

There are zero add-ins installed, it's not a very customized install of Directory Opus, most things are default.

If it still opens Edge, there might be something in Settings > File Types that's overriding the double-click action.

Well:

... it does say that it's opening the file with Microsoft Edge (which it does), but I have no idea why it does so:

... every other tab/entry/setting inside Directory Opus' "Edit File Type" thing is completely default/blank/not defined. Zero trace of anything that would point towards why it thinks it should open it with Microsoft Edge.

You're assuming correct. I didn't even know that was an option, I'm not using the viewer pane.

As I said: everything is pretty close to vanilla, this is the first time I even opened the File Type settings in Directory Opus.

The Open With dialog should have an option to make that choice permanent.

If that isn’t working, try reinstalling the PDF viewer and rebooting. That often fixes the registry details that different PDF tools fight over.

If it’s still not working, please go to Settings > File Types, then open the dialog’s menu at the top and choose Diagnostic, and share the results via reply or private message.

I know, I did choose "Always" every single time.

I did, to no avail. I have uninstalled and reinstalled Adobe Reader and made it the default. I rebooted several times. Given that Edge is integral part of Windows 11 and Windows 11 limited the control applications have over default file associations even further, my hunch is that these tools have a hard time overwriting the Windows default.

I made Soda PDF, Firefox, Affinity Designer and PDFGear the default. They work as expected everywhere except for double-clicking the file in Directory Opus 13.

In fact, the "Open" dialog inside Directory Opus opens the correct program, it's only the default double-click that doesn't.

But there simply is no overriding double-click commend set:

There are no scripts installed:

This is the behavior I'm experiencing:

Open in Windows Explorer -> Opens default PDF Viewer
Double-Click in Windows Explorer -> Opens default PDF Viewer
Double-Click anywhere else in Windows (e.g. on the Desktop) -> Opens default PDF Viewer
Asking Firefox to open a PDF externally -> Opens default PDF Viewer
Right-click, then Open (default, bold) in Directory Opus -> Opens default PDF Viewer

Double-Click in Directory Opus -> Opens Microsoft Edge

I really don't know what else to do, but I don't think this is simple user error at this point.

This feels like a bug, in either Windows or Directory Opus, but it's only negatively affecting my interactions with Directory Opus.

Since you appear to be struggling to believe me that I know how to set default file associations in Windows 11 (and Microsoft did make it quite tedious and annoying), here are some screenshots, using Adobe Reader as an example:

There is absolutely no sensible reason why Directory Opus is so convinced that it should open .pdf files with Microsoft Edge instead.

That's not a setting, it just reflects what's in the registry.

Have you tried toggling Opus' Explorer Replacement (Preferences / Launching Opus / Explorer Replacement)?

I know it's not a setting, it clearly can't be toggled. But it's also clearly Directory Opus' incorrect interpretation of what is in the registry, given that every single other program correctly opens the files with the configured viewer and every user facing settings dialog and setting in Windows 11 agrees with that - except for Directory Opus.

Here's another one:

For all intents and purposes, the old file type association settings that this dialog is referencing is gone in Windows 11. There's certainly no more direct, intended, way to access it anywhere from the system.

And if that's what's in the registry, it's in the registry because Windows 11 24H2 intentionally put it there, I'm hoping for good reasons. I'm not actively using Edge, it came with Windows.

Given that a UAC dialog pops up when I try to delete the PDF File Type inside Directory Opus, am I correct to assume that it tries to erase system settings and not just dopus-related settings?

I just did that, it had absolutely zero impact on file handling of any sort as far as I can tell. I toggled it back, again: no change.

Send us the diagnostics:

You could add an override there to solve the problem. The Left double-click event will take priority over the other actions and events, and can be set to the same thing you see for the Open action on the tab next to it.