/usr/share/doc-base/winff is in winff-doc 1.5.3-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Title: Winff Manual
Author: Matthew Weatherford <matt@biggmatt.com>
Abstract: This manual describes how to use winff.
Section: Video
Format: PDF
Files: /usr/share/doc/winff/WinFF.en.pdf.gz
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