GSview is a freeware utility which works with ghostscript.
First you need installing Ghostscript which is an interpreter for the PostScript language and then you can install Gsview which is a sort of graphical interface, since ghostscript is based on command lines.

In view menu, set alpha-text and alpha-graphics to 4 bit/pixel.

You can find these great utilities at:
http://www.cs.wisc.edu/~ghost/