As a side note it might be worth mentioning that I am on Titan Poker but also, during the SNGs Titan show....
Current Hands: -
Last Hand: -
Where as in cash games that i've observed they show the proper hand #s in the corner.
This is because their game numbers have become too large. PT has had the same issue with other sites once the game #'s exceed 2,147,483,647. The "number" field they are using to store the game #'s cannot hold this large a number (they need to use a number field that is able to hold a larger number) so what it does is converts the number to a negative number. The fact that their support stated in the reply Paul posted that it's really not a negative number pretty much indicates they don't have a clue about what the problem is.
However, your files have an additional problem. The format is missing things from the header of the XML file, specifically the table name. That is why PT is having problems with your files.