[Xastir] .shp vs poly.shp

[Keith Kaiser]

I use http://xastir.tamu.edu/2004/states/ for maps and download the
entire state file. In that file by county are files label e.g.
GIS/MO/MO_Platte_County_Poly.shp and GIS/MO/MO_Platte_County.shp can
someone please explain the difference to me and then make a
recommendation as to which I should be using in Xastir?

Thanks in advance
-- 
YIS/YIV
Keith D Kaiser -- Venturing Roundtable Commissioner
kaiserklan.com
kaiserklan.com/roundtable
kaiserklan.com/wa0tjt