Quote from: michaeldb on October 11, 2011, 01:10
Interesting question. I don't know how the agencies do it, but here is one way.

-Open Notepad (or other plain text editor)
-Drag the .eps file into it.
-If it is an eps 8 file, you will see a line like this in the top few lines of the file (probably the second line):
%%Creator: Adobe Illustrator(R) 8.0
-If it is an eps 10 file you will see a line something like this (maybe the third line):
%%Creator: Adobe Illustrator(R) 13.0

AI files are more complicated.
Maybe other people know of better ways to do this.