In your shellstyle.dll file mate,
search this box text:
<if id="atom(LibraryIdentifier)">
to change its size and its police, add these properties (example):
fontface="Arial"
fontsize="10pt"
<if id="atom(LibraryIdentifier)">
<Element
padding="rect(4rp, 16rp, 0rp, 0rp)"
fontface="Arial"
fontsize="10pt"
fontstyle="shadow"
fontweight="bold"
fontquality="cleartype"
contentalign="endellipsis"
foreground="gtc(TextStyle, 9, 2, 3803)"
/>
</if>
gtc(TextStyle, 9, 2, 3803) determines the color for this text you can find here: Styles > TextStyle > ControlLabel > Disabled
or just replace this text:
foreground="gtc(TextStyle, 9, 2, 3803)"
by
foreground= "argb(255, x, x, x)"