/usr/lib/pd/extra/iemlib/hp7_butt~.pd is in pd-iemlib 1.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X obj 22 42 inlet~;
#X obj 53 66 inlet;
#X obj 22 209 outlet~;
#X text 62 42 ~signal_in~;
#X text 90 67 <float> cutoff_frequency [Hz];
#X text 183 86 <float> interpolation_time [ms];
#X text 33 187 ~filtered signal_out~;
#X obj 149 86 inlet;
#X text 99 205 1.arg: <float> cutoff_frequency [Hz];
#X text 99 215 2.arg: <float> interpolation_time [ms] (opt.);
#X obj 22 167 hp1c~ \$1 1 \$2;
#X obj 22 146 hp2c~ \$1 1.80194 1 \$2;
#X obj 22 127 hp2c~ \$1 1.24698 1 \$2;
#X obj 22 107 hp2c~ \$1 0.445042 1 \$2;
#X text 5 5 hp7_butt~;
#X text 81 5 highpass 7.order with butterworth characteristic;
#X text 176 275 IEM KUG;
#X text 160 263 musil;
#X text 190 263 @;
#X text 196 263 iem.at;
#X text 111 252 (c) Thomas Musil 2000 - 2005;
#X text 159 285 Graz \, Austria;
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#X connect 10 0 2 0;
#X connect 11 0 10 0;
#X connect 11 1 10 1;
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#X connect 12 0 11 0;
#X connect 12 1 11 1;
#X connect 12 4 11 4;
#X connect 13 0 12 0;
#X connect 13 1 12 1;
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