RichWidgets\Popup_(version 6.0.0.) Editor don't upload MS 2007 documents

I am using the RichWidgets\Popup_Editor source web block to upload documents to the database.
When I upload a MS 2003 word document then there is no problem. When I tried to upload a MS 2007 word document, it see "no file found".
Is this a typical MS problem or do I need another version? Now I am using version: RichWidgets 6.0.0.
Hello Rob,

Can you post the error log?

I think I have a problem in the FileType attribute of UploadCache Entity. Its to short and the FileType of Ms2007 documents its bigger than 100 characters.
Try to increase the length to 500.