tktrans apparently implements [shape]d windows.
It is available only for [Windows].

[AH] 4 Dec 2005: The project home page is at [http://www2.cmp.uea.ac.uk/~fuzz/tktrans/default.html], but the binary distribution at SourceForge
[http://sourceforge.net/project/showfiles.php?group_id=11464] seems to have been [stubs]-enabled by Jeff Hobbs, so it's probably a better bet.

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[DKF]: This package works by using the bright magenta parts of an image as a mask.  This is a horrible trick.  ''[FW]: Not bright magenta in general, at least, just #FF00FF.''

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