You can now open this - details in the comments below.
OK, you can now open this massive file. It may take awhile but you can open this test data file.
Unfortunately original sample resolution is poor. I've just given it lots of data points for testing.
Google earth doesn't like this many data points and simply gives up on displaying the data, without telling you - it does take you to the location of the launch however. In my next round of development, whenever I have big data like this I'll give options - such as:
Time range for full resolution, load only 1 point for every half second, etc.
That way you'll be able to traverse the full high resolution data even though the full thing simply overwhelms google earth.
Soon I'll put up our balloon data file.