WndField.cpp
in CWndInventory::OnDraw
You can find
m_p2DRender->TextOut( x + 42 - size.cx, y + 42 - size.cy, szTemp, 0xff0000ff );
m_p2DRender->TextOut( x + 41 - size.cx, y + 41 - size.cy, szTemp, 0xffb0b0f0 );
which 0000ff is the Blue color
and b0b0f0 is a lighter blue, which overlay the other blue, makes it stand out more
To change number colors in taskbar:
WndTaskBar.cpp
CWndTaskBar::OnDraw
Same there, look for these
p2DRender->TextOut( point.x + 32 - size.cx, point.y + 32 - size.cy, szTemp, 0xff0000ff );
p2DRender->TextOut( point.x + 31 - size.cx, point.y + 31 - size.cy, szTemp, 0xffb0b0f0 );
etc etc,, just search for 0xffb0b0f0 in source to find it, that color is pretty unique