H264 QT will not play on Windows

We encoded a QT H.264 movie, it has the .mov ending. Now we found out, that it does not play on Windows. The error message says "this is not a movie file" on a Mac it plays with no problems...
We are kind of lost - I don't know how to find out what is wrong. The QT Players on Windows are current versions, VLC for Windows plays the file with no problems...

I have created two H264 files using identical settings exporting via Quicktime from iMovie (using a 720p camcorder source). Encoding the video so the file is over 4GB, I can play it on the Mac, but not on a PC, even with the latest Quicktime downloaded. I don't even get a blank file, just an error that it cannot understand the file. Encoding with a lower bitrate, I get the file down to quite a bit below 4GB and then it plays fine on Windows as well as the Mac. Any ideas why? I thought at first it was the disc format on Windows (but it is using NTFS, which is not supposed to have any file restrictions). I appeared to have the same issue in Windows XP and WIndows Vista (though Windows Vista only copied 4GB of the much larger originally encoded file and couldn't see the rest of it). Is there something else restricting the file size apart from the disc format?

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