Compile time warning when using 'Microsoft.Office.Interop.Word._Document.Close'

The only way I've managed to resolve the warning is to use an explicit cast:

var doc_close = (Microsoft.Office.Interop.Word._Document) _doc;
doc_close.Close();

If you already have a using for Microsoft.Office.Interop.Word you can simplify the cast to:

var doc_close = (_Document) _doc;
doc_close.Close();

or even just

((_Document)_doc).Close();

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