Extracting the package file to install the files. This is in ROS Learning Course

Please assist in handling the following error after running the following commands. This is in relation to the Hello (Real) World with ROS – Robot Operating System

ERROR 1
jared@ubuntu:~/Downloads$ sudo dpkg -i hrwros-21.daa
[sudo] password for jared:
dpkg-deb: error: ‘hrwros-21.daa’ is not a Debian format archive
dpkg: error processing archive hrwros-21.daa (–install):
dpkg-deb --control subprocess returned error exit status 2
Errors were encountered while processing:
hrwros-21.daa

ERROR 2
jared@ubuntu:~/Downloads$ sudo dpkg -i hrwros-21.sif
dpkg-deb: error: ‘hrwros-21.sif’ is not a Debian format archive
dpkg: error processing archive hrwros-21.sif (–install):
dpkg-deb --control subprocess returned error exit status 2
Errors were encountered while processing:
hrwros-21.sif