I've opened files as large as 1.5gb with textpad. These same files crashed notepad, wordpad, notepad++, editplus. Have you tried gedit? Beyond that, I would consider trunchating the file.
It may sound strange, but have you considered reading the file into matlab? My large data files were CSV, but could you try reading it into a 1xsuperlong array in matlab? Could then manipulate the array into smaller arrays and output smaller text files.
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