to get the pc version I believe you need to download that version of the codec.
I use black magic hardware and have 8 and 10 bit versions of their quicktime codec on the G5 and PC.
I can render out of AE from the pc, then import that into fcp and play it in realtime.
I had to teach this to our compositor because he was initially doing what you were, rendering out though to animation, then importing it, then rendering a gain so it would play in realtime.