I'm writing a Winforms app in Dot Net 2.0.  I created a few PNG images for
use as button images in order to liven up appearances a bit.  I thought I had
given the images a transparent background using Paint.Net and they display
correctly on my own computer (a lenovo T60p laptop).  However when the app is
run on another computer (A Dell desktop with a flat monitor, if I remember
correctly) the images have a white background.  (The actual button background
color is the system default grey.  I have not changed that.)

Am I forgetting some setting?

Tool for clickonce maifest and application signature validation
In-Memory Assemblies
Array initialization in class
Inserting Text into a Doc File
Add question mark to title bar