Ah, you don't want to edit the 4 GB file, you only want to view the content. For viewing files quickly I used the great file manager Total Commander
which I use as 100% replacement for the Windows Explorer because of it's great features not only for handling files and directories.
It has a built in ZIP packer and can unpack all common archive formats. It has a built in FTP interface so I don't need a special FTP program for uploads and downloads. It can compare files by content and also synchronize directories/drives with several options. It has hundreds of daily used features.
But the most often used feature of Total Commander except the basic file handling functions is the Lister. The built in Lister of Total Commander which is also available as free standalone tool displays the content of a file quickly. It autodectects the format of the file and displays it either as text or in hex. All text formats are supported by the Lister of Total Commander (OEM, ANSI, Unicode, UTF-8, Unix and DOS, ...). It also supports RTF and HTML format and displays these files as simplified text without the tags except the user wants to see the real content. It also supports some common graphic formats like BMP. And it can display every file because there is no size limit. You can even search in the file and copy a marked part of it to the clipboard. Last you can change the current view of the file at any time. You want to see a text file in hex, no problem with the Lister. You want to see the current file as Unicode (resource strings in executables) or prefer OEM character set, you can change it quickly by simply pressing a hotkey or clicking on the appropriate menu item. The Lister can even be extended with plugins programmed by other users. I use several Lister plugins.
So if you want an universal viewer, look at Total Commander or the standalone free Lister.