From C-Command Software:
File Adopter uses your Internet Config preferences to add type and creator codes to files that lack them. Typeless files are common on Mac OS X, and are a source of numerous frustrations. File Adopter works with simple drag and drop. It can replace existing type and creator codes if they disagree with Internet Config, or only add codes when they are absent. After adopting a file, it shows you the changes it has made. You can also hold down Shift to orphan a file, instead of adopting it. This is useful if you know that the file has incorrect codes but that the correct ones aren't in Internet Config.