Trouble exporting Alpha on PC

Hi there,
I have some CGI shots that were delivered to me in Quicktime Animation with Alpha that I need to edit and return to the client in a similar format (with transparency).
Premiere CC views the clips with Alpha just fine. As soon as I try to export the clip to a format that I know supports Alpha (such as Quicktime Animation or DNxHD 185bit 4:4:4) the client says that "there is no alpha channel" in the footage, it is lost. As if the video exported not in RGBA but in YUV.
After a few failed attempts at this, I just moved the project to my Macbook and rendered the media there in both Prores 444 and Quicktime Animation, both of which had maintained the transparency just fine.
My question is - what am I doing wrong? I can't seem to get Alpha out exporting anything on Windows, while doing exactly the same in OS X seems to work just fine.

Hi,
Still on CS6 here, but QuickTime Animation with Alpha export works fine. Just be sure to select "32 bit" under the VIDEO tab in AME, default is 24 bit. And before delivering to client, simply Import the clip you made back into Premiere and toss it on the timeline over any other media to check for alpha.
Thanks
Jeff Pulera
Safe Harbor Computers

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