Dear Sir, I do not know if this information is useful for you but program EmEditor (www.emeditor.com) is able:
to open up to 248 GB or 2.1 billion lines with only a little memory to open even larger than 248 GB by opening a portion of the file with the new custom bar - Large File Controller I do not have personal experiences with this editor (my files are smaler), but found on Internet, that some programmers use this one for manipulating with big files. Sincerely, Michal Karlik -- <http://forum.pspad.com/read.php?4,49191,49243> PSPad freeware editor http://www.pspad.com
