I use a wide variety of apps for my job as a motion designer. Adobe creative Suite, Maxon Cinema 4D, Ableton Live, etc. many of these apps open windows file Explorer by default. Is there a way to make it so that directory opus is always the default file Explorer and completely replaces Windows file Explorer anywhere it might pop up on my computer? I think it even comes up when I'm downloading something with Google Chrome. I have a very intricate file system, so it's very disorienting when I have to go back to Windows file Explorer.
I know this isn't what you truly want (which many of us also want), but you can kind of get there by "sharing" things between Directory Opus and the File Open/Save dialogs using a program called Quick Access Popup (QAP). QAP integrates with DOpus and can provide shortcuts to folders you have open in DOpus.
The author of QAP, Jean Lalonde (@jnllnd), is responsive on this forum. If you have questions and tag him (as I just did), I'm 100% positive he will respond. But, please do so in some other category, like Tools, so I don't get in trouble.
There are also some scripts, like the one linked below, that might provide useful features similar to what QAP and other tools offer, if you don't want to install a "bigger" solution.