/usr/share/man/man1/mewcat.1.gz is in mew-beta-bin 7.0.50~6.7+0.20170719-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/mewencode.1.gz
/usr/share/man/man1/mewencode.1.gz