To configure WebExplorer to use GSview
for viewing PostScript files, select
Configure | Viewers...
then select PS/EPS/AI PostScript from the Type drop down list box
then type gvpm.exe in the Program edit field. If GSview is not on your PATH, you will need to type the full pathname, e.g. c:\gs\gvpm.exe.
Make sure that the GSview "Options | Safer" is checked.
To test if your configuration is correct, display this PostScript file.