/usr/lib/pd/extra/iemlib/ap2c~.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 63 inlet;
#X obj 22 233 outlet~;
#X text 62 42 ~signal_in~;
#X obj 85 88 inlet;
#X text 194 155 <float> interpolation_time [ms];
#X text 32 200 ~filtered signal_out~;
#X obj 159 155 inlet;
#X text 89 65 <float> -180_degree_frequency [Hz];
#X text 12 9 ap2c~;
#X text 60 8 comment;
#X text 58 9 allpass 2.order for filter-cascades;
#X text 137 235 2.arg: <float> damping [-];
#X text 137 244 3.arg: <float> frequency-shift [-];
#X text 137 254 4.arg: <float> interpolation_time [ms] (opt.);
#X obj 56 258 outlet;
#X obj 88 283 outlet;
#X obj 119 302 outlet;
#X obj 160 322 outlet;
#X text 129 282 dummy;
#X text 159 301 dummy;
#X text 124 88 <float> damping [-];
#X text 137 226 1.arg: <float> -180_degree_frequency [Hz];
#X obj 126 111 inlet;
#X text 162 111 <float> frequency-shift [-];
#X obj 22 181 filter~ ap2c \$1 \$2 \$3 \$4;
#X text 176 365 IEM KUG;
#X text 160 353 musil;
#X text 190 353 @;
#X text 196 353 iem.at;
#X text 111 342 (c) Thomas Musil 2000 - 2005;
#X text 159 375 Graz \, Austria;
#X connect 0 0 25 0;
#X connect 1 0 15 0;
#X connect 1 0 25 1;
#X connect 4 0 25 2;
#X connect 7 0 18 0;
#X connect 7 0 25 4;
#X connect 23 0 25 3;
#X connect 25 0 2 0;
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