Hi Dan,
Yes, as Rajender wrote, This is because this connector is Embedded in CCS.
By instance with "CA IDENTITY MANAGER R14.1.0 SERVER COMPONENTS FOR WINDOWS - ESD ONLY" (GEN500000000000099.zip) package;
the "Windows NT" C++ connector comes when running the "Provisioning\ProvisioningServer\setup.exe" from this package,
selecting the Connector Server (C++) (with Provisioning Server or not).
I add that on the Windows NT endpoints, you need to install the "Provisioning Agent for Windows Local Users and Groups" by using the setup.exe.
With my r14.1.0 sample, this is under PROVISIONING COMPONENTS (GEN500000000000098.zip) package from \RemoteAgent\Windows200x folder.
Regards,
Philippe.