Icons in Datasheet view for lists in Microsoft Office SharePoint Server 2007 are not displayed correctly when you have Microsoft Office 2003 Client installed.
https://support.microsoft.com/default.aspx?scid=kb;en-us;2161806&sd=rss&spid=11373
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https://support.microsoft.com/default.aspx?scid=kb;en-us;2161806&sd=rss&spid=11373