Is there a way I can hide a running app's dock icon Mac OS X?
Important Note: In Mac OS X 10.5+ the method explained below only works for apps which are not using the "Code Signing" feature which was introduced in 10.5 to ensure authenticity of running code. The result of applying this method to a signed app differs; it might cause the app to crash upon starting or results it unexpected behavior.
You can edit the file
When you will start the App you will see the icon just for one second and the it will disappear.
Hope this helps because I don't know anything about Macs and had to do a lot of research before I finally got it right. This web page was where I was at when I finally got it right so I'm logging this one for future reference.