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{\rtf1\ansi\ansicpg1252\deff0{\fonttbl{\f0\fnil\fcharset0 Tahoma;}}{\colortbl ;\red255\green255\blue0;}\viewkind4\uc1\pard\cf1\lang1033\f0\fs400 Sample Text\par}

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{\rtf1\ansi\ansicpg1252\deff0{\fonttbl{\f0\fnil\fcharset0 Tahoma;}}{\colortbl ;\red255\green255\blue0;}\viewkind4\uc1\pard\cf1\lang1033\f0\fs24 Sample Text\par}

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That's the internal rich edit functionality, so you'll need to take that up with Microsoft

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