For text files, Notepad is pretty much useless. For short files I'm using Notepad++, I tried using plain Notepad and I can't describe exactly why but it's almost unusable in comparison. And for large files (MBs to GBs) I'm using less. From git bash.
And if I need any sort of rich text formatting, there's the free Libre Office which is usually good enough for the job. In case I need the actual MS version suite, I've got a Microsoft Office Home and Student retail license on my wife's laptop. The one that I actually own, not the SAS crap they're pushing nowadays.
Otherwise I find Libre Office fairly crappy and barely usable but for opening and looking in the occasional MS file, it's good enough. The "Excel" (Calc) is by some reason horrendously slow in drawing charts. Like if I got an 1000 rows CSV, it becomes almost unusable. On a machine that could have been used in the 90s to do galaxy collision simulations at NASA. Excel, obviously doesn't have this problem.
In summary both Notepad and Wordpad are useless to me.