Prefs Manager 1.0 Beta 6
When you run Prefs Manager, it displays the file name, creator, type, size and date.
You can choose to delete the preferences from this list. It isn't perfected yet, but it gives you an idea on how it functions.
For more detailed information, including on updates, please read the documentation or visit the home page.
This program can be used with Mac OS 9.0 and later, and on Mac OS X. It may work on Mac OS 8.6, but I haven't tried it on that version, and the author doesn't say.