My favourite after trying a few to read a 6GB mysqldump file:
PilotEdit Lite http://www.pilotedit.com/
Because:
- Memory usage has (somehow?!) never gone above 25MB, so basically no impact on the rest of my system - though it took several minutes to open.
- There was an accurate progress bar during that time so I knew how it was getting on.
- Once open, simple searching, and browsing through the file all worked as well as a small notepad file.
- It's free.
Others I tried...
EmEditor Pro trial was very impressive, the file opened almost instantly, but unfortunately too expensive for my requirements.
EditPad Pro loaded the whole 6GB file into memory and slowed everything to a crawl.