Find .scap content with spotlight?

Hi all, I just bought Scapple and I’m very pleased with it, but I just found out that Spotlight doesn’t seem to index the contents of .scap files. Is that true? Is there an easy way to fix that? (Just changing the extension to txt is enough to make Spotlight find the content, so I could just keep a folder with .txt versions of the .scap files, but that seems a bit cumbersome…).