Can't you create a little script with Automator and launch that from your app?
Set Desktop wallpaper on Mac OSX
BlitzMax Forums/BlitzMax Programming/Set Desktop wallpaper on Mac OSXThe forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.