I have a document library in SharePoint whith a custom content type. There is one custom field that is set by an item added event receiver each time a new document is uploaded.
My problem occurs when someone opens a document with Word and uses the "save as" option in the Word menu to save a new document. My event receiver sets the correct value to my field and then Word is setting the field back to the old value again.
How can I prevent Word from changing my field ? The field is hidden, readonly and sealed.