About troubleshooting legacy SWF files

Some legacy FLA and SWF files (created with Flash MX 2004 and earlier) might not work when you test or deploy them locally (on a hard disk) because of security changes in Flash 8 and later. This might happen when a SWF file tries to access websites outside its domain, and, in this case, you need to implement a cross-domain policy file.

You might have FLA or SWF files created in Flash MX 2004 or earlier that have been distributed to users who do not use the Flash authoring tool but have upgraded to Flash Player 8 and later. If your locally tested or deployed legacy content (an old SWF file on a user's hard disk) breaks because it tries to communicate with the Internet when playing in Flash Player 8 and later, you must rely on users to explicitly trust your content in order for it to play properly (by clicking a button in a dialog box).

To learn how to fix legacy content for playback on a local computer, see Fixing legacy content deployed on local computers.

Flash CS3

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