Icon For Application?

We develop with AcuBench and run our applications from a UNIX platform using Thin-Client.  We have tried everything we can find in attempt to get a new Icon to appear for our application (putting ICON variable in Config, Setting ICON in Properties of screen, etc)...the default Acu icon is all that will ever appear?!?

Does anyone have ideas of how to make this work?

Attached is the icon file we are attempting to use.