How to split large file on Windows?

There is a freeware Windows file splitter called HJSplit

Available here. The website claims it can split files of any type and size, but 9GB is a big file.

The GNU Core Utils package (available here for windows) includes the Split utility. It works well for me :-)

The --help documentation is as follows:

Usage: split [OPTION] [INPUT [PREFIX]]
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default
size is 1000 lines, and default PREFIX is `x'.  With no INPUT, or when INPUT
is -, read standard input.

Mandatory arguments to long options are mandatory for short options too.
  -a, --suffix-length=N   use suffixes of length N (default 2)
  -b, --bytes=SIZE        put SIZE bytes per output file
  -C, --line-bytes=SIZE   put at most SIZE bytes of lines per output file
  -d, --numeric-suffixes  use numeric suffixes instead of alphabetic
  -l, --lines=NUMBER      put NUMBER lines per output file
      --verbose           print a diagnostic to standard error just
                            before each output file is opened
      --help     display this help and exit
      --version  output version information and exit

SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.

For example, to split input.txt into 100Mb chunks, only splitting at the ends of lines,

split input.txt -C 100m

will give you output files named xaa, xab, xac, etc.

One can use 7-Zip to create segments of text file in certain size (e.g. 100 MB segments out of 1.5 GB log file).

The Key options are - Use "Store" as opposed to "Compress" - Use "Split to volumes"

You should be able to see text in .001 (.nnn) files.