If you tell me your (e.g., “extract sounds from an old game” or “change text in a Flash menu”), I can recommend the exact feature + tool.

If you don't need to re-design the whole file and just want to change a graphic, a link, or a text string, you might not need to export to FLA.

the SWF back into a source format (like FLA or XFL ). Edit that source file in a compatible program. Re-export it as a new SWF. Best Tools for Editing SWF Files

A decompiler extracts resources (images, sounds, scripts) from the SWF and converts it into a readable format.