/usr/share/yorick/i/custommp.i is in yorick-mpy-common 2.2.04+dfsg1-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | // FHS: customization should go under /etc/
// include /etc/yorick/mpy/custommp.i if it exists
include, "/etc/yorick/mpy/custommp.i", 3;
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