quicktime Combustion horrors...

Right hello again...

ok. I have defected to PC to run combustion on.

for the most part its a huge relief.

But i have an incredibly annoying problem and i wonder if there is anything i can do about it:

I have quicktime installed on the PC. I can read quicktime movies in it, no problem.

But i cannot read them in Combustion.

also - although Combustion will write quicktime's - i can only open them on the PC. On mac they open with the bottom half of the screen blacked out.
oh dear.

Presently i have to render out tiffs to an external HD and then use Quicktime on the mac to convert them. This ends up taking about 4 hours. Double oh dear.

Am i completely naive in thinking that Quicktime would work properly on PC? Or is there something i can do to be able to render Quicktimes on a PC that will open on a mac?

The codec i am using is the AvidDNxHD codec - which is perhaps the most accurate cross platform codec i've seen - the movies do look almost identical on mac or PC ... which only adds to my suprise that it won't work across platforms.. .

obviously i am limited to rendering in 3 minute chunks (4GB) even if i could get it to work - but in my workflow that would be no problem at all.

however - wasting time rendering to an external disk when i could be rendering direct to my solid state drive, and then having to spend around 4 hours converting 26 mins of tiffs is a a problem for me.

so - if anyone has any suggestions i would be delighted!

ps: i tried reading the quicktimes in VLC on the mac - but VLC didn't understnad the Avid codec... hmmm...

i realise this question is on the cusp of not being about Combustion at all but i thought i'd give it shot on this forum.... (!)

thanks in advance to any wise words
matt