Why is the Windows prebuilt package still not 64-bit?

Surely even ten years ago all developers had switched to 64-bit development machines. So why are the pre-built Windows packages for the GNU tools still 32-bit? C++ programs compiled for 64-bit machines run faster in my experience (because of the larger general register set, and because exception support in the 64-bit Windows ABI has zero run-time overhead except when exceptions are thrown), also the additional memory might allow GCC to perform better optimisation.

I know I could build 64-bit versions of the GNU tools myself. However, we develop open source firmware, and it's important to me that the any user can download and install the tool chain without having to go through a complicated build process first.

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