You should just be able to use SaveAs.
oDoc.SaveAs("MyFile.doc", ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing);
If you are using .NET 4.0 you don't need the oMissings.
S
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