This is not an "inaccessible file", but a nested git repo.
It is recorded in the main git repo (published on GitHub) as a gitlink, a special entry in the index, and is displayed as a gray icon.
If you really want its content, you should transform it as a submodule.
As such, that gitlink points to nothing, as there is no way to know the remote url of that repo (only its SHA1 which is what the gitlink records)
This is not an "inaccessible file", but a nested git repo.
It is recorded in the main git repo (published on GitHub) as a gitlink, a special entry in the index, and is displayed as a gray icon.
If you really want its content, you should transform it as a submodule.
As such, that gitlink points to nothing, as there is no way to know the remote url of that repo (only its SHA1 which is what the gitlink records)