This extension was part of Blender 4.1 bundled add-ons. It is now offered as it is, with limited support.
No changelog for this release.
This extension does not require special permissions.
I'm going to give it a FULL rating because I know exactly what this can do for me and its overall potential.. However...
It appears to be broken, at least for me, using blender 4.2.2LTS on linux.
The basis of the problem is pathing. everything I do is 100% relative and so the extension reports the .blend asset file as //../../../../Assets/chairs.blend .. but when I load the blendfile through this addon it gives me an empty blender project named '/Assets/chairs.blend' <-- completely blew off the path
This is one of those "I don't need it until I need it and then I REALLY need it" addons. If you're working with massive scene files containing tens of thousands of objects (e.g. large architectural developments), being able to offload areas to separate files is crucial. But when you need to edit those areas quickly, this addon becomes so helpful. Thank you to those who develop and maintain it!
There are many convenient plug-ins, but they conflict with a very useful plug-in (Blender Quick Groups). After using it, the file path does not work.