[Haskell-cafe] Using Apple Spotlight to search for .hs and .lhs files

This isn't really a Haskell question but I'm guessing some Haskell hackers have a solution. MacOS X's Spotlight doesn't seem to be able to search for text in .lhs and .hs files. But it can find text in .txt files. Is there a way of getting Spotlight to treat .lhs and .hs files like .txt files so I can instantly search all of my Haskell source? -- Dan