Office 2007 document upload - files corrupt

Adding a file to SharePoint can be implemented through a web service as described in the note from Microsoft. It works fine - for all types of documents except for Office 2007 documents!

Upload goes fine - but when you try to open the file using Office you get the following errors:

The Office Open XML file cannot be opened because there are problems with the content.

• Microsoft KB 928282 - Excel and Word related - not relevant
• Depressing news ...

Solution

SharePoint seems to have an error when adding documents to the filecollecting using the

SPFolder.Files.Add

function. If you add from a byte-array it simply fails with Office 2007 documents. But if you convert the byte-array into a stream, e.g. by saving the byte-array into a file and loading it into a stream, then it works. It's unclear to me why this error occurs - but Microsoft probably drops a single byte in the byte-scenario - which is critical for Office 2007 documents, but other documents seems to survive.

Input and comments very much appreciated.