Windows Preview Pane

I would really like to know if there is a way to make the image of a .dwg file in the Windows 7 Preview Pane larger.  It is so small, it is really hard to see enough details to know what dwg it is.  I am using DraftSight to sort through many,  many .dwg files and this is a real problem for me.

Any help of suggestions would be greatly appreciated....

Alan H