/usr/lib/pd/extra/pdstring/printwchars-help.pd is in pd-pdstring 0.10.2-4.
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 18 19 20 21 | #N canvas 82 52 450 300 10;
#X text 141 266 Bryan Jurish <moocow@ling.uni-potsdam.de>;
#X text 17 231 SEE ALSO:;
#X obj 86 230 pdstring;
#X obj 150 230 locale;
#X text 153 45 "ABC";
#X text 193 173 First argument is prefixed to output;
#X msg 44 44 list 65 66 67;
#X msg 54 64 foo 49 50 51;
#X text 153 65 "123" \, selector "foo" is printed extra;
#X msg 67 87 228 246 252;
#X text 159 115 "&pi &delta" in UTF-8;
#X text 35 7 printwchars - print wide character strings to pd console
;
#X text 157 89 "ä ö ü";
#X msg 71 115 960 948;
#X obj 44 172 printwchars mywchars;
#X connect 6 0 14 0;
#X connect 7 0 14 0;
#X connect 9 0 14 0;
#X connect 13 0 14 0;
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