InfoPath 2010 browser-enabled forms cannot be opened - "The following document is not a valid InfoPath form"

Environment:

SharePoint 2010, InfoPath 2010 browser-enabled forms

Issue description:

We have a lot of InfoPath forms in SharePoint 2010.  These forms were migrated from InfoPath 2003 client to InfoPath 2010 browser-enabled. Occasionally a few InfoPath forms cannot be opened in browser with the following error:

There has been an error while loading the form.
The following document is not a valid InfoPath form: {path of form} 

Cause:

After doing some research and comparision, I noticed that we have a rich text field in the form that users use to copy and past html content from the internet. The pasted content includes the following string that caused this issue:

<?XML:NAMESPACE PREFIX = "[default]" http:="http:"  xmlns:http="urn:http"  ?>

Resolution:

• Download the form to local machine. Open the form in notepad. Find the above string and delete.
• From SharePoint library, find the affected item.
• Checkout the item (if checkout is required)
• Upload a file to the library, point the path to the local path of the newly saved xml file.
• Save
• Open the form from SharePoint, it should open in browser without any issue.

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