All reports of unknown-control-file for the archive. The extended description of this tag is:

The package contains an unknown control file. Policy says that putting additional files in the package control area is not generally a good idea.

Refer to Debian Policy Manual section B.2 (Package control information files) for details.

Severity: normal, Certainty: possible

Check: control-files, Type: binary, udeb

This tag has not been emitted in any package tested by Lintian.