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/usr/lib/pd/extra/windowing/README.txt is in pd-windowing 0.1-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Porvides:
  hammimng~, hanning~, blackman~, cosine~, connes~, bartlett~,
  welch~, lanczos~, gaussian~, and kaiser~

Usage:
  Windows inlet signal on each DSP block and sends to outlet
  
  gaussian~ takes one optional argument (standard deviation)
            May be set by float in left inlet

  kaiser~ takes one option argument (alpha)
	    May be set by float in left inlet

  See windowing.pd

To build:
  Linux:   make windowing_linux
  Windows: nmake windowing_nt