When .ai files are actually PDFs

So, in an earlier thread today, AI or EPS?, Wade questioned whether .AI files are really PDFs.
I did a survey just now with Illustrator CS5 (15.0.2) on Mac OSX, on a document with a single letter 'p' (400pt Myriad Pro Regular). Saving in all current and historical Illustrator formats:
Bytes
Format
"file" output
226448
PDF
PDF document, version 1.5
927086
CS5.ai
PDF document, version 1.5
918678
CS4.ai
PDF document, version 1.5
924026
CS3.ai
PDF document, version 1.5
924062
CS2.ai
PDF document, version 1.4
1267139
CS.ai
PDF document, version 1.4
1196072
10.ai
PDF document, version 1.4
1102797
9.ai
PDF document, version 1.4
249039
8.ai
PostScript document text conforming DSC level 3.0
7179
3.ai
PostScript document text conforming DSC level 3.0
Now, I realize you might not trust the "file" program... If you're not familiar with it, according to the manpage:
file tests each argument in an attempt to classify it. There are three sets of tests, performed in this order: filesystem tests, magic tests, and language tests. The first test that succeeds causes the file type to be printed.
But it just does some crude (and not-so-crude) pattern matching.
You can also run some reports in Acrobat Pro. For instance, running "Report PDF Syntax Issues" produces two identical reports, except the AI version has a Color space section (different uuids, diffrent embedded subset font names, etc.). That's not very helpful.
Browsing the PDF contents does show some more information. Indeed, half of the file size difference is color space information, though I'm not sure what the other half is:
There are other subtle differences.
Convinced yet?

No one's harmed as we all know this since forever.
It is wel documented on the forum.
By not saving it with the pdf option check reduces the size a great deal many users use it to save master files and then do a save as with the option turned on when they place it in another application.
In case you are not familiar with this option turned off and printed to a postscript printer the file will print properly even if it does not display the right way.
At least that is my understanding.

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Avox Systems Web Site: http://www.avoxsys.com
AVOX SYSTEMS
AIRCRAFT SYSTEMS
Rick Barusic
Senior Technical Writer
225 Erie Street - Lancaster, NY 14086 - USA
Tel: 716-686-1706
[email protected]
http://www.zodiacaerospace.com
The information transmitted is intended only for the person or entity to
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material. Any review, retransmission, dissemination, or other use of or
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error, please contact the sender and delete the material from any
computer.
From:   MichaelKazlow <[email protected]>
To:     rick barusic <[email protected]>
Date:   11/24/2010 10:32 PM
Subject:        Some CGM graphics do not appear when
FrameMakerfiles are converted to PDF
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Message was edited by: MrChicken

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When .ai files are actually PDFs

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