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It basically says that the .spr file is really a zip file, and you can directly access the XML files that create these mappings. Simply edit it, rezip it, and rename it back to .spr. None of my PCs recognize my DirecTV.spr file as a valid zip archive after renaming it
I'm afraid Sling Media have encrypted the SPR files so although they are still technically ZIP archives you can't open them.
You might want to try designing your own remote, see my posting at https://community.sling.com/thread/8533?tstart=0.