It seems that mime exclusion filters are applied even to URLs that are
explicitly passed on the command line (the starting point URLs one wants to
fetch).

Not only is this is a bit inconsistent with URL exclusion filters which appear
to leave these primary URLs scheduled for download, but it also makes it hard
to fetch any linked items except other HTML files as -mime:text/html will
exclude the starting point URLs as well.

This is a problem with sites that do not provide proper file extensions.