The OS will always beat whatever Blender file window will have for file capabilities. Example: Many times I need to research what kinds of files are part of where I want to open a Blender file. I have to exit Blender’s file explorer and use the one from the OS.
I don’t think it’s unreasonable to offer a “find in folder” button that opens the OS file browser. That would open the folder we are browsing in Blender’s file browser.
Currently, I would have to copy the address in Blender’s file address, open the Windows Explorer then paste the address in the file browser search for the file there.
That does not sound like professional software, right?