You need to read ...
THIS THREAD ...
Also keep in mind that Pelles C is a one man project by Pelle Orinius. Pelle's pretty smart and sometimes very productive, but still merely a human being with all the limitations that implies.
One of the big pushes in the other thread is that of fleshing out the Headers and Libs for C to include COM, DirectX, DShow, etc... It simply isn't reasonable to ask Pelle to do *all that* by himself. So if you can convert some of this stuff to "Pelles way" headers, I would encourage you to do so and then share them with the rest of us...
As for 64 bit architecture... that is fully supported, but only on 64 bit Windows. If you look in the User Contributions and AddIns sections you will find that many of us have been offering both 32 and 64 bit versions for quite some time. If you are using 32 bit Pelles C on a 64 bit system, you need to download Pelles C, 64 bit from
HERE If you are still on 32 bit Windows you need to upgrade.