I’m kinda surprised that there are no provisions to address the file navigation UI. Blender uses its own file navigation finder which can be both good and annoying. For instance I frequently throw stuff on my Desktop as an easy to find location that I can summon from the open file window by pressing Command-D. This is not possible in Blender, and neither is the ability to press the spacebar within the file window to get a full screen preview of the file (very handy when opening texture files, but also FBX and OBJ files).
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