Stumbled across this old forum post from 2011 where someone named "ValleyBell" posted a tool called "ClickTeam Extractor" for extracting resources from ClickTeam games that seems much more advanced than my KNPUtils. Includes source code and file format documentation! Given that it's hosted as a MediaFire link from 2011 it's a miracle that it's still online, so I'm mirroring it here.