Some old games created the savegame files themselves prior to playing to make sure that there was place on the HD for those savegame files, or simply for organisation.
Some archivers, for a reason well beyond my understanding, seem to flag all the files they have unzipped as archive files. Those files can't be overwritten since they are read-only. This prevents the game to save the game since in this case the game don't try to create a new savegame file but to overwrite the existing ones.
Try to remove both the archive flag and the read-only file from all the files of the game.
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