Add buttons in Blender UI to open directory of blend file or output path in the OS explorer.
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Add 3 buttons in the Properties>Output pannel "Toggle path mode" button simply switch the output path between relative and absolute
Add 2 buttons in the header of the filebrowser "Blend location" button bring the filebrowser where the blend is saved (button does'nt appear if not saved)
"Open folder" button open the path of the filebrowser in the OS explorer.