/etc/interchange/catalogs.cfg is in interchange 5.7.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # Insert your catalog definitions here
#
# Example:
# Catalog debian /var/lib/interchange/catalogs/debian /cgi-bin/ic/debian
|