Hi,
Thank you for your replies, I really appreciate it.
Your reply regarding the cell phone reminded me how when I had run into the same thing on a cell phone I had found another app that does go in filename order (a 3rd party file manager). Remembering this lead me realize that I had just assumed the Media Player was the only choice for an mp3 player on the Roku, but it turns out that was an incorrect assumption; there are actually other choices and at least one of them, the first one I tried, DOES go in order. That said, that player has some other weaknesses (mainly, handles directory navigation in a very non-standard and cumbersome manner) so it would definitely still be very nice if they ever did decide to do more work on the Media Player to still fix the issue (make it go in filename order or add a new sort option to do so).
As for the tool to deal with the tags, thank you, that's a great idea. I did some research and it turns out that my CD to mp3 conversion program defaulted to adding an ID3 tag (although turns out could have been manually configured to not do so). Based on some research, apparently such tags are entirely optional and not even part of the original mp3 format's design, so I think a very poor choice as a default because it just increases the file size and even eventually lead to this problem with the Media Player. I wish I had known about it adding those sooner or I would have turned it off in the first place before I did any conversions. Thankfully my vinyl conversions don't have the same problem (no tags in those) because I used an entirely different process for them. But now all my CD to mp3 conversion result files are burdened with those tags so regardless of finding that player that goes in order I still would like to fix them (probably just use the tool to remove them entirely).
Thank you for your suggestion regarding using a DLNA server. I did actually look into that a few years ago (for purposes of the other advantages you mentioned) but unfortunately found no DLNA server would run on my machines at the time (minimum requirements issues). But I'll take another look. As an aside, back when I was trying to get that to work I also did some research on just going with the vastly more simple approach of a standard Windows share and found out that unfortunately the Media Player doesn't support this. That said, if they ever do more work on the Media Player, I really do think they should add that (support for accessing Windows shares). But as I said, that's a bit of an aside because I assume it would still go out of order unless they also fixed that separate issue.
Thank you again