Support Windows XP

[Dukc]

On Sunday, 2 May 2021 at 18:15:04 UTC, Imperatorn wrote:
> I modified the PE header (set major version and subsystem to 5) 
> and it worked 🌞
>
> No idea how much ub this causes tho.

Care to explain this in beginner-friendly way? I think it's 
likely it will help other people with same kinds of problems.

DMD for Windows should work just as well in XP as in later 
versions, as far as I know. I don't think it depends on any 
functionality introduced after XP.