>> There is a wide-spread belief that PDF is just a kind of "binary
>> version of" PostScript.
>
> Interesting thing I've read somewhere: PDF is derived from .ai (Adobe
> Illustrator). You can just rename a .pdf to .ai and it will open in
> Illustrator. This works most of the time but not always. I've also tried
> renaming .ai files to .pdf and it doesn't open in Acrobat...

Having never used or even seen Illustrator, I couldn't comment. I'd 
imagine whatever the file is named, it's looking for the magic number at 
the start to decide what to do with it.

There was once a rumour that if you rename a PostScript file to PDF, 
Acrobat Reader would be able to open it. This isn't true, and when you 
consider that PDF is just a data format while PostScript requires a 
language interpreter to actually *execute* it, it's not surprising really.

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