Script to insert the name of the file in to Microsoft Word docx files

Hello I have a directory with a number of files (around 100 or so) in Microsoft Word .docx format (recent version). I need a script that will automatically insert the filename of the document in to the first line of the file, and put two blank lines after it. So if the file was called [login to view URL], it would look like this: (start) Filename: [login to view URL] Blah blah Blah blah Blah blah Blah blah Blah blah Blah blah Blah blah Blah blah (ends) Program must run on Windows 7 and be able to be used multiple times, in multiple directories (but does not have to be at the same time). There should be no limit on the number of files it can process, but I expect it will be run against folders with around 100 files in them. Thank you.