...would print the first 10 reads to the screen. It's worth noting that BBTools is developed in Windows so I can guarantee that all of the programs work in Windows as well as Linux.
Windows 10+ also has "Windows Subsystem for Linux" which can make this kind of thing much easier, allowing to (hopefully) use BBTools' shell scripts, for example, so the syntax would simpler:
reformat.sh in=file.fastq out=stdout.fq reads=10
I'm about to reboot my computer to install Windows Subsystem for Linux to see what it can do now... hopefully it has standard utilities like zcat and head, which are convenient for looking at fastq files.
There are a number of bioinformatics workbenches that will run under windows, and will allow you to analyse fastq files.
Some examples are:
Unfortunately these are all quite expensive, although some offer a free trial.
If you just want to look at the file, then I've had luck opening big files with Notepad++. However, if you want to open a 12GB file in any of these sorts of tool (assuming thats 12GB uncompressed, not .gz), then you will definately need at least 12GB of free memory.
If really all you need to do is look at the file. Then you might try opening the powershell application and using
As @dsull said, you won't really learn anything new from manually looking at millions of sequences.
If you insist on viewing, you can use the tools view command to view fastq files just like the less and more commands on linux