The "B037" and ".002" extensions indicate this is a split archive . Because the total collection is hundreds of gigabytes, it is broken into smaller chunks (in this case, 286 MB pieces) to make downloading and hosting easier.
You cannot "mount" or "extract" a single segment. You must reconstruct the full sequence. Download File B037 - CCC-N15-BB-R.7z.00286.0 MB...