Try first managing a smaller version of this file first. And this is where the classic techniques never die.
Run cmd.exe which will be available on Windows
Navigate to the directory containing the file (you can do this by typing "pushd" and then right-clicking and pasting the directory).
Use the head command to create a version of the file that will contain a specified number of lines from the original file. (example: head -n1000 original.txt > header.txt)
In this example the -n1000 specifies the number of lines taken from the original file, which in this case is 1000 because I specified 1000; likewise, if you want only 100 lines, change it to -n100.
The original.txt would be the name of your original file which be the name and then the extension which is .csv.
The ">" symbol specifies to send the information to the new file, which in this example I've named header.txt, which will write the new file in the same directory.
This should make it MUCH easier to handle with and explore this .csv.