/usr/lib/pd/extra/iemmatrix/mtx_sfread-help.pd is in pd-iemmatrix 0.2-1.
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 15 16 17 | #N canvas 439 256 841 379 10;
#X text 482 28 part of iemmatrix;
#X obj 33 116 mtx_rand;
#X msg 32 207 bang;
#X obj 32 249 mtx_print file;
#X obj 32 228 mtx_sfread 10 ./test_mtx_sfwrite.wav;
#X obj 33 146 mtx_sfwrite ./test_mtx_sfwrite.wav;
#X msg 33 94 10 3;
#X obj 94 116 mtx_print original;
#X text 43 34 [mtx_sfread][mtx_sfwrite];
#X text 165 69 reads the rows of a matrix from a multichannel sound
file;
#X connect 1 0 5 0;
#X connect 1 0 7 0;
#X connect 2 0 4 0;
#X connect 4 0 3 0;
#X connect 6 0 1 0;
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