So did a fresh install of Windows 11 and the issue seems to persist. Sometimes doing a fresh install would fix this in the past.

Are the files just the same color as the background? Try clicking in the dialog to see if you can highlight or load something that way. Could be some color depth issue with their dialog system.

You haven't indicated whether Windows 11 is set to show or not show hidden files, folders and drives in Folder Options. Perhaps the save games or the folder the save games are located in have "Hidden" attributes set.

IDK if Windows II got as anal as ubuntu, but I had a problem with dosbox on that where the user that launched dosbox didn't have permission to write to the directory it was trying to save to. Some variation of that may be involved.

All hidden files are set to be shown as I need that for other things. I can type the save file name in the box and it loads but clicking in the file selector does not highlight anything. I can save games just fine so I don't think it's some sort of file permission issue.

I would still try changing the color depth before launching the game, if you haven't already try setting your desktop to 16bit. If not try setting compatibility mode to the oldest windows 11 allows. This just looks like a UI incompatibility which you might be able to fix with some of the "compatibility options" as well.