Attached Link: http://www.editpadpro.com/editpadlite.html

Give Edit Pad a shot... I know that a huge number of developers in this community use oen version or another and I swear I couldn't live without it. "EditPad does not impose a limit on the size of files you can open and edit with it. Also, the maximum length of a single line is not limited. (Most other editors cannot handle lines longer than, say, a thousand characters, even if they do claim to support files of unlimited size.)"