I have checked at your xml file. By default, it was opened in Excel. Did you edit xml with Excel? Maybe this is the reason for the problems.
For example, I have over 3000 lines in my xml file and the size of the file is 2069KB. Your file has over 2400 lines, yet the file size is 4769KB. So, there are probably some data in your xml, that can not be recognized by NX.
I would advise the same as JohnRBaker already did. Try to edit this xml file in Wordpad or Notepad. I have copied and paste one line in Notepad, then change the standard and some parameters. And it worked.