/usr/lib/pd/extra/rtc/show-pitchclass-help.pd is in pd-rtclib 4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #N canvas 3 48 400 230 10;
#X text 86 139 pitch;
#X msg 40 139 1A;
#X obj 40 106 show-pitchclass;
#X text 20 178 2004 by Karlheinz
Essl;
#X text 20 23 show-pitchclass;
#X text 20 55 Shows the pitch class
of a MIDI note number.;
#X msg 280 23 Harmony;
#X floatatom 40 80 0 0 0 0 - - -;
#X text 86 81 MIDI note number;
#X connect 2 0 1 0;
#X connect 7 0 2 0;
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