umenu populate order

It's been a long time since I tried this, but it used to be that umenu was simply populated in the order the host OS listed the files in the API calls. On Mac OS this has always been alphabetical order. On Windows, however, the OS used to list files in chronological order of creation date (or something like that).

The order in which the Windows File System calls report files may have changed, or umenu may have changed since then. You need to test on Windows to be sure. And you may need to sort if having alphabetical order on Windows is important to you.