I don't recommend putting custom dictionaries in: "C:\Program Files\Sigil\hunspell_dictionaries". They may not persist through a Sigil upgrade/downgrade/uninstall/reinstall (and I don't recommend modifying Sigil's Program Files directory regardless).
Instead, put them in the "hunspell_dictionaries" folder in your Sigil User-Preferences location (Edit->Preferences; click the "Open Preferences Location" button). That's what it's there for. That way, they will persist throughout any upgrades and such.
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