However, the file names on the disc are being truncated to 8.3 characters.
You could configure your burning program to use ISO9660 level 2. This would allow 32 upper case characters with one dot. If it also allows Rockridge extensions (Unix files), it should be shown correctly on the Amiga (with mixed case and multiple dots).
Or you could install MakeCD inside WinUAE and use it to burn a real Amiga CD (ISO9660 level 2 with Amiga extensions).