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Both are executables. They are named:
setup_dungeons_3_-_campaign_-_a_multitude_of_maps_v1.7_build11_512e183_(36205).exe
6.49 MB
and
setup_dungeons_3_-_campaign_-_a_multitude_of_maps_v1.7_build11_512e183_(36205)(1).exe
5.22 MB

What is the difference between these files?