Use the name "index.json" instead of "bl_ext_repo.json". This makes more sense as the name is automatically added to the end of file:// URL's a little like index.html for web-sites.
Use the name "index.json" instead of "bl_ext_repo.json". This makes more sense as the name is automatically added to the end of file:// URL's a little like index.html for web-sites.