/usr/lib/mime/packages/winff is in winff 1.5.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | application/winff; /usr/bin/winff %s; description="WinFF preset file"; nametemplate=%s.wff; test=test -n "$DISPLAY"
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