RCMP Central Registry File
The following files seem to be from the Royal Canadian Mounted Policy Central Registry.
The document list suggests there were 5 volumes (1-2-3-4-5), but there is no evidence of a Volume 4 and 5. They might have been contained in the Volume 3 folder (as Volume 2 was contained in 1 - see the note regarding Volume 1 and 2, below).