MPEG IMX 625/50 codec problems CS5

Hi All,

I have some .mov files that were shot on an Arri Alexa (720x576 25i native), recorded onto sxs cards, transfered to a mac then copied via portable hard drive to a pc.  Problem is, the files play fine on a MAC but with the exception of VLC, nothing on the PC will play them - not even Quicktime!  QT says they are in  mpeg imx 625/50 format.  Can anyone tell me how to import them into CS5 so I can edit them on the PC.  Windows 7 x64.

Thanks.