When you save an InfoPath 2007 form that has a value that contains a percent sign and double-byte character set (DBCS) characters, the value is not promoted to a list column in Windows SharePoint Service 3.0 as expected
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Consider the following scenario.
You publish a Microsoft Office InfoPath template to a form library on a 64-bit SharePoint site.
You use the template to create a new document in the form library.
You edit a field in the document by using a value that contains the percent sign (%) and double-byte character set (DBCS) characters.
You save and then close the document.
In this scenario, the value is not promoted to the list column in the SharePoint site and you cannot edit the document in InfoPath again. Additionally, if you download the document and then open it by using Notepad, you see that the file is not an InfoPath XML file.
To fix this problem, install hotfix KB 969414 and hotfix KB 968857.For more information about these hotfixes, click the following article numbers to view the articles in the Microsoft Knowledge Base:
969414 Description of the InfoPath 2007 hotfix package (Ifswfe.msp): April 30, 2009
968857 Description of the Windows SharePoint Services 3.0 hotfix package (Sts.msp): April 28, 2009