In addition to what KevinH said; there have been issues (for a long time) with the calibre OpenWith plugin and Windows and Sigil. The plugin "clears" the environment before launching Sigil (specifically) on Windows. Which means any environment variables (and possibly command-line args) that Sigil may get launched with are stripped beforehand. Perhaps you'd have better luck using the new(ish), built-in Open With feature of calibre.
Either way, I don't believe this particular error is something that can be "fixed" by the Sigil plugin developer.
Last edited by DiapDealer; 11-10-2015 at 12:24 AM.
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