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Consider the following scenario:
You upload a .mht file to a Microsoft Office SharePoint Server 2007 document library.
You create a custom column in that document library.
You edit the values of both the Title and the Custom column properties.
In this scenario, the .mht file is corrupted.
To fix this problem, apply the following hotfix package:
978389 Description of the Windows SharePoint Services 3.0 Cumulative Update server hotfix package (Sts-x-none.msp): February 23, 2010
A .mht file is typically a MIME document that contains multipart or mixed content-type. The first or the main part of the file is HTML and the other parts support images or cascading style sheets. However, a .mht file can have a part that uses a multipart content-type that is defined in itself. This behavior confuses the built-in MHTML parser.
This hotfix lets a pluggable parser to override the existing built-in MHTML parser. Therefore, you can replace the existing parser with a no-operation (no-op) parser.