Serving Mac files from http server presents a problem, since you cannot
serve the resource fork. If you try to use MacBinary, you will not be
able to launch the player application, because macMosaic will launch
MacCompress by default, that will uncompress your file, but will not
automatically launch the viewer for the uncompressed file. So, only files
that consist of data fork only can be served and launched immediately.
Good test to determine if this is the case is to transfer your file to
FTP server in binary mode, transfer it back to your Mac, restore its
creator/file type and see if it would play.
Aleks