One of the downsides of the way Final Cut Studio handles many modern formats (wrapping from m2t/mxf/mp4 to quicktime) is that the files are difficult to play on Windows, even with Quicktime player. Because Apple hasn’t made things like its HDV component available for windows, you were out of luck.
Calibrated Software comes to the rescue with a set of decode-only codecs for OSX and Windows, which allow you to play back DVCProHD, XDCam (HD/EX), HDV and more. They’re very reasonably priced, and seem like a great solution for folks who need to share content from FCS with PC users, or even with other Mac users lacking the FCS quicktime components.