.docx was created in unreleased version of office 2007 ?

Hey,

Since today i've been busy with OpenXML creating .docx files.
I created a simple program which generates a .docx from a textbox field.

When i open these files with winzip i see it contains the basic things to open the .docx and show it's content. When i however create the same document using Ms Word and open that file with winzip I see a lot more files:
- a folder docProps containing app.xml and core.xml
- in the folder word some more files
    - fontTable.xml
    - settings.xml
    - styles.xml
    - websettings.cml
    - folder called themes

The problem is when i open my own created file, i get a information dialog box. Every time i see this message (even if i have saved the .docx file in word). Error
Translated this means: This document was created in a version of office 2007 that wasn't released in the market. If you save the file it will be converted to a more recent fileformat.

After i save the docx file i keep seeing the message.

Does anyone know what I need to add to my code (namespace, file, ..) to make this message disappear ?

Ok never mind,

I just used an older namespace.
Fixed now..

Sorry this post