It's possible just creating a batch file to launch fontview and passing it the path as a parameter might work without needing to copy the fontfile at all. Sigil's Open With works entirely different on Windows for launching batch files than it does for launching exe's.
The batch file route might offer the use of command-line switches to handle parameters for fontview.exe properly.
I still may knockup a plugin for this. Windows batch file/powershell chicanery is above the paygrade of the average Windows user.
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