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Is there a way to transfer your highscores from a Steam installation of the game to the GOG version? I tried copying over data/arcadescore0000.dat and data/novicescore0000.dat, but the GOG version doesn't seem to be recognizing them.

In addition, I've got a bunch of old replays from version 1.02, which now requires the special replay viewer to watch, but I can't find this anywhere in the GOG version.
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Did you put your scores in the data folder? If it still didn't work after that, it is probable that the Steam data files are incompatible the the GOG version of CC.

I'll request that the old replay utility be added to the next revision on GOG.