I have Ubuntu 13.10 64-bit and there are 2 choices: Double-click the file directly to run the 64 bit version from the /desura/common/one-late-night/Build10/ directory ~or~ rename the 32-bit version to something and then rename the 64 bit version to the name of the 32 bit version (IE: OneLateNight.x86_64 to OneLareNight.x86) and that should allow you to launch the game from the desura listing of your games.
stevedude
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