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Currently only 32-bit Windows builds are officially supported. These are created using an rather old MinGW version (because of the ability to build code that can be used for Internet Explorer extensions).
### Clarifications
This text uses three terms:
*[MinGW](http://www.mingw.org/) - Minimalist GNU for Windows
*[Minw-w64](http://mingw-w64.org/) - a fork of MinGW that is able to build 64-bit binaries
* Mingw - addresses any of the above mentioned projects
**Warning:** The two projects *Minw-w64* and *MinGW* slowly diverge as users are reporting an increasing list of incompatibilities.
# Motivation
Currently only 32-bit Windows builds are officially supported. These are created using an rather old MinGW version (because of the ability to build code that can be used for Internet Explorer extensions). After the release of 64-bit Firefox for Windows some users were asking for a 64-bi Windows extension.
The branch **mingw-w64-building** contains experimental modification so that [Minw-w64](http://mingw-w64.org/) can be used to build both, 32-bit and 64-bit code for Windows.
The branch **mingw-w64-building** contains experimental modification so that [Minw-w64](http://mingw-w64.org) can be used to build both, 32-bit and 64-bit code for Windows.