/usr/lib/pd/extra/rtc/BPM2ms.pd is in pd-rtclib 4.1-2.
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 | #N canvas 38 77 230 184 10;
#X obj 36 101 outlet;
#X obj 36 46 inlet;
#X text 60 102 1998 by Karlheinz
Essl;
#X obj 36 73 expr 60000/$f1;
#X connect 1 0 3 0;
#X connect 3 0 0 0;
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