Arcon files conversion

Im using Arcon 1.0 wich use only the .aco extension for objects.Other versions use extension .o2c. I downloaded the "o2c player" that have in right-click menu a save option to .o2c and .aco. But saving as .aco the Arcon dont recognize the file. Is there a program that convert o2c to .aco? Better yet. Is there a way to convert .3ds files to .aco? Thanks to all.
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