/usr/lib/pd/extra/windowing/blackman~-help.pd is in pd-windowing 0.1-3.
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 text 168 40 formula:;
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#X msg 94 66 1;
#X obj 94 46 loadbang;
#X obj 102 365 pddp/pddplink http://en.wikipedia.org/wiki/Window_function
-text wikipedia: window functions;
#X obj 438 -14 import windowing;
#X msg 36 154 \; pd dsp 1;
#X text 21 85 height --->;
#X text 15 6 description: generates a blackman window for each dsp
block;
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#X obj 127 132 blackman~;
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#X restore 326 65 graph;
#X text 168 70 0.8*cos(2*pi*x);
#X text 168 55 0.42+(0.5*cos(pi*x))+;
#X obj 102 380 pddp/pddplink http://mathworld.wolfram.com/BlackmanFunction.html
-text mathworld link;
#X text 103 317 SIGNAL: a blackman window with size=dsp blocksize;
#X obj 435 6 pddp/pddplink http://wiki.puredata.info/en/blackman~ -text
pdpedia: blackman~;
#X text 102 394 Windowing functions are used with FFTs. These transform
the signal block-by-block into a spectral representation whose resolution
in both the frequency and time domains are proportional to their size
(as a power-of-two in PD). The different windows have different characteristics
in terms of stopband attenuation and noise bandwidth.;
#X text 102 258 SIGNAL: the height (amplitude) of the window is controlled
by the signal on its inlet.;
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