Project build in 3.0 runs on OS X 10.4.11?

Do projects built in XCode 3.0 run on older computers using Tiger? I tried a quick compile of an example project and it would not launch on my computer at work which is still on Tiger. Is there a build preference to older compatibility.

Yes, they can. You need to set the Deployment Target to 10.4 (or even to 10.3 if you want).
In your project, double-click the blue top icon of your project. Go to the build tab. Set the Deployment Target in the Deployment section to 10.4. In that case it will run on 10.4 and newer.

thanks, I appreciate the help.