Converting EMF Resource to Platform Resource (IFile)

Simple one:

EObject eObject = ...;
Resource eResource = eObject.eResource();
URI eUri = eResource.getURI();
if (eUri.isPlatformResource()) {
String platformString = eUri.toPlatformString(true);
return ResourcesPlugin.getWorkspace().getRoot().findMember(platformString);
}
return null;