At the moment, Dan Zimble has discovered a work around. But this bug should be fixed.It appears that the Wizard's bug does not recognize the .prj files in ArcGIS's default projection directory (<a href="file:C:/Program" target="_blank">C:\Program</a> Files\ArcGIS\Coordinate Systems) but by copying a .prj from that directory and moving it into another (e.g. <a href="file:C:/demos/FedUC2007/ImageServer_Plenary)" target="_blank">C:\demos\FedUC2007\ImageServer_Plenary)</a> the New Image Service Wizard can browse to it and when added, it changes the default.For example, by coping "WGS 1984 UTM Zone 17N.prj" from "<a href="file:C:/Program" target="_blank">C:\Program</a> Files\ArcGIS\Coordinate Systems\" and pasting it in "<a href="file:C:/demos/FedUC2007/ImageServer_Plenary/" target="_blank">C:\demos\FedUC2007\ImageServer_Plenary\</a>" you can change the default "World_Mercator" to "WGS 1984 UTM Zone 17N".