>>I would recommend the automatic solution by Christian Isberner. You can use that code on a server. If you don't want to write the automatic code in C#, you can create a simple VFP exe that you run from C# and it will externally process the file and return to you when it's completed.
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>>It's the only way to make sure all valid .docx files are handled. It will follow Windows natural updates on installed tools, etc.
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>However, I believe this requires Microsoft Office to be installed on the server or a related add-in.

It does. It's a fairly inexpensive add-on, however, and especially so for what it gives you in the ability to manipulate all standard Office formats through automation.