http://bugs.winehq.org/show_bug.cgi?id=31952
--- Comment #2 from J V jonathan-vola@hotmail.com 2012-10-13 05:08:42 CDT --- Some more testing shows that setting textures to low affects the surrounding textures but not the lines, they remain perfectly 1px thin.
Lines become thicker depending on sampling: Supersampling provides thin lines as in screenshot, subsampling provides thicker lines.