You receive an error message when you try to upload an HTML document to

This article has been archived. It is offered "as is" and will no longer be updated.
When you try to validate an HTML file at you receive the following error message:
Sorry, I am unable to validate this document because its content type is text/plain, which is not currently supported by this service.
Microsoft Windows XP Service Pack 2 is installed on your computer.

Update information

To resolve this problem, install the MS05-020 security update. For more information about how to install the MS05-020 security update, click the following article number to view the article in the Microsoft Knowledge Base:
890923 MS05-020: Cumulative security update for Internet Explorer

Article ID: 890327 - Last Review: 01/16/2015 09:01:19 - Revision: 2.7

  • Microsoft Windows XP Professional SP2
  • Microsoft Windows XP Home Edition SP2
  • Microsoft Windows XP Tablet PC Edition Service Pack 2 (SP2)
  • Microsoft Windows XP Media Center Edition Service Pack 2 (SP2)
  • kbnosurvey kbarchive atdownload kbwinserv2003sp2fix kbqfe kbprb KB890327