/usr/lib/mono/4.5/PEAPI.dll is in libmono-peapi4.0a-cil 4.6.2.7+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/mono/4.5/../gac/PEAPI/4.0.0.0__0738eb9f132ed756/PEAPI.dll
/usr/lib/mono/4.5/../gac/PEAPI/4.0.0.0__0738eb9f132ed756/PEAPI.dll