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LOL, that would be a disaster using cygwin for that, there really is no point either, we should keep our advantages not give them to all the other platforms!
Besides, Windows's isntaller is alright, sure it sucks for the system but for the suer it's pretty good. There is a lot of work to be done on the current autopackage, I don't think there will ever be a time in which the developers will think "Oh, well we added every feature and fixed every bug, let's port it to Windows!"
We shoudl just improve our *nix version instead of wasting resources porting IMO.
I also think it would be an incredible amount of overhead porting it to non *nix platforms.
I sure hope it won't be ported to to oher non *nix platforms in the future.