I have setup a web server, in which I have a password protected directory for files. I need to know what MIME type to add to my server configuration for ISO (Disk image files)

Update: I found finaly that some people use application/octet-stream for iso, so I tryed this and although it seems to work at first, the filesize ends up being difernt.

The iso i created holds my mp3 files I will be burning onto dvd. The actual filesize is reported to be 4,753,848,320 bytes inside Windows Explorer. However the file when downloaded from the server is only 458,881,024

I thought this might be a limitation on the server, but i tryed other web server packages and the same results, might this be a problem with octet-stream?