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Mingw-w64 delivers runtime, headers and libs for developing both 64 bit (x64) and 32 bit (x86) windows applications using GCC and other free software compilers.
Version 3.0 is the stable release and is required for GCC 4.8. A lot of development has gone into it; main changes include:
Version 2.0 is the previous release; it greatly expanded the support for Windows Vista/7 APIs.
Use the latest GCC version; versions down to 4.5.1 are supported but each new version brings many improvements.
The project page has the full list of releases and more details. You can report bugs via the Issue Tracker or notify us directly on IRC on #mingw-w64 on OFTC, via the web-based client or via a relay on freenode.