I'm using SPD to edit an HTML file that's in SharePoint (in a subfolder of SiteAssets). Later, I return to the file in SPD to find that the following content has been added to the file (where "www.contoso.com" is my site's address):
<html xmlns:mso="urn:schemas-microsoft-com:office:office" xmlns:msdt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882"><head>
<!--[if gte mso 9]><xml>
<mso:CustomDocumentProperties>
<mso:_dlc_DocId msdt:dt="string">2TTW66AP5EP2-4-16</mso:_dlc_DocId>
<mso:_dlc_DocIdItemGuid msdt:dt="string">99e55405-8ec0-4d75-950a-a29493433d06</mso:_dlc_DocIdItemGuid>
<mso:_dlc_DocIdUrl msdt:dt="string">http://www.contoso.com/_layouts/DocIdRedir.aspx?ID=2TTW66AP5EP2-4-16, 2TTW66AP5EP2-4-16</mso:_dlc_DocIdUrl>
</mso:CustomDocumentProperties>
</xml><![endif]-->
</head>
How can I prevent this content from being added to my file? Alternatively, is this a good thing? Do I want this content for some reason?