I have this issue (or a very similar issue) on Karmic as well:

$ file --brief --mime ubuntu-9-10-rc-desktop-amd64.iso 
application/octet-stream; charset=binary

$ file ubuntu-9-10-rc-desktop-amd64.iso 
ubuntu-9-10-rc-desktop-amd64.iso: ISO 9660 CD-ROM filesystem data 'Ubuntu 9.10 
amd64              ' (bootable)

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Message "does not seem to be a valid ISO9660 image" on Intrepid
https://bugs.launchpad.net/bugs/271677
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