The release label refers to a cracked software distribution by the long-standing "Scene" group CYGNUS (CYGiSO) . This group specializes in distributing unauthorized versions of high-end technical, CAD, and engineering software. Group Profile: CYGNUS (CYGiSO)
Since modern Cygwin installations support 64-bit (x64) Windows, applications compiled for Cygwin can run natively on x64 Windows systems. This provides a good balance between the compatibility of Unix-like tools and the performance offered by native Windows execution. x64--CYGiSO