I showed the proof of how "unconventional" the sorting of the filenames is with regards to letter case ...
As someone who has spent the last 40+ years playing with computers and micro-controllers of all sorts ... the sorting order you are showing looks perfectly conventional to me. This is how ASCII works. I guess that is why I was confused by your comments - every example you list, I think, "but that's perfectly sorted according to ASCII coding."
I do understand what you desire, and I even agree that it would be a nice feature, but having written a fair bit of UI software, I can attest that it is, relatively speaking, a lot of work. Very doable, of course, but typical of the adage that software development requires 1% correct calculations and 99% UI tweaks ... the latter especially because each person,
in different cultures, has different expectations about what is conventional. Should the numbers be reported as 99,01 or as 99.01? Should the date be 2025-02-11, or 2-11-2025, or ... ? Yes, one can write the UI to provide choices and flexibility, but that means one is focusing 99% of attention on UI and only 1% on actual function.
When I made the choice between the Rigol 804 and the Siglent 804 last year, I did give thought to the UI. There seems to be widespread (though of course not universal) agreement that the Rigol UI is easier for newbies. As a complete newbie to DSOs, I worried that I would need that extra help. As it turns out, the Siglent UI, while it makes a few odd choices to my way of thinking, has generally been perfectly straightforward. Maybe that is just because of my long experience with ASCII, Linux, etc. (FWIW, I haven't ever encountered a UI that doesn't include some odd choices, or at least not the choices I would make! Which is where one might usefully look at the extensive hacking of the UI going on in the Rigol threads - at least two different individuals are reworking the UI to their own expectations and desires ... which, if I understand correctly, are not mutually compatible!)
Since I don't have a dog in this fight, I'm going to bow out of this conversation. I had hoped to make a helpful observation, but since we have different expectations for what sorting looks like, I can see that it was not helpful after all. Ah, well ...