Flash version control is a big topic, but the intention of this article is not. Since most source file version control system such as SVN does not handle binary files like fla or swf, it's really hard to keep track of the version of a fla file.
Is there really nothing we can do?
This article introduce a JSFL script that provides the basic functionality of version control by recording a version number (and increase it too), as well as by who and at what time a fla file is edited automatically.