For cross-platform applications, I think VSCode is actually the best here. If he notices that this is a large file, he will automatically turn off syntax search and all the nice features, but will leave, at least with basic search and replace, etc. I use this for 1-3 GB files regularly for Wordpress, because sometimes permalinks are not updated when changing domain names for developer sites, etc. etc.
If you have Linux or Git Bash installed on Windows, then you will have access to vim, which I recommend for just 4GB +. I had to change the rows manually in the MySQL 6GB + file and it works fine. You will think that this does not work, because reading from a disk in RAM may take about a minute, but it will work. You will want to estimate how many times you will save, because it will write as much as 6 GB back to disk, and navigation will also require the use of search, line numbers, etc., but it works.
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