Adobe Reader could not open 'Firefox 4.0-2.dmg' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded).

Tried to download Firefox 4 for Macintosh three time and could not prevent Adobe Reader from interfering.

The following document should help: Error: Adobe Reader could not open '*.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and was not correctly decoded.)
Please update this thread if your issue is resolved.
Thanks,
Shashi

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