/usr/share/metview/etc/SubpageFrameRules is in metview-data 5.0.0~beta.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | %if SUBPAGE_FRAME = OFF %then
%unset SUBPAGE_FRAME_COLOUR
%unset SUBPAGE_FRAME_LINE_STYLE
%unset SUBPAGE_FRAME_THICKNESS
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