A while ago I posted a note about how to resolve the warning: no rule to process file warning in Xcode. That post showed you how to solve the problem in Xcode 3. The same warning can be resolved in Xcode 4 by following these steps:
1) Select Project Navigator
2) Select your project
3) Select your target
4) Select Build Phases
5) Move the files you don't want the compiler to process from Compile Sources to Copy Bundle Resources