/usr/lib/pd/extra/windowing/cosine~-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 obj 102 363 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 103 377 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.;
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#X text 169 52 cos(pi*x/2);
#X text 15 6 description: generates a cosine window for each dsp block
;
#X obj 435 6 pddp/pddplink http://wiki.puredata.info/en/cosine~ -text
pdpedia: cosine~;
#X obj 170 169 tabsend~ \$0-cosine;
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#X text 102 258 SIGNAL: the height (amplitude) of the window is controled
by the signal on its inlet.;
#X text 103 317 SIGNAL: a cosine (otherwise known as a sine - actually
it's half a sine) window with size=dsp blocksize;
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