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There used to be a bunch of utility executables in the win32 folder - planet_mapgen, dump_versioned_json and pack_versioned_json {or something along those lines} that seems to be gone for me now. If you read this, can you do me a solid and see if they're present in your install, just to check if it's a GOG-specific issue?
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I have no result when I search for "json" on my game folder, I have 64b version so you may whant someone with 32b version to check that.