Be sure it is with the right text enconding... I don't remeber wich one it is, it's stated in the docs actually.
Also, it's not
XML code:
<ResetUserColor R="225" G="0" B="0"/>
, it is
XML code:
<ResetUserColor>
<R>255</R>
<G>0</G>
<B>0</B>
</ResetUserColor>