So, I'm lost. I can't open a 4gb csv or txt file in any program. Every URL Extractor I've tried doesn't work since everything is formatted in .csv, IE: It has "www.whatever.com" quite a bit. If I could open the file in notepad, I'd just do a find/replace and then be okay, but I can't. I've tried splitting the file into 100 meg versions, but it still locks up my notepad. (I'm running Windows 7, 9 Gigs Ram, i7 Proc) I'm out of ideas. If you had to extract urls from a 4gb file, what would YOU do?