What you can do with it:
Preview flash movie and every element before exporting
Edit dynamic texts and replace images
Extract element of the Flash movie such as shapes, morph shapes, images, sounds, videos, frames, fonts, texts, buttons, sprites and ActionScripts.
Export FLA data that can be rebuilt in native flash environment
Convert flash files between exe and swf format
Edit flash files, add innovation to current flash movie
Metrix Media Software Inc. offers a FREE Flash Decompiler Gold, which meets your needs for flash decompiling.

Great feature recommended:
1. Start a flash file.
2. Tick the components you want to export in Resources list then click Expoet FLA button on resources list
3. Export rebuild data dialog appeared under the movie information dialog
4. Browse the file path, check or uncheck the "Open the folder after export" box. Click Export button to start the export process. Now, you can edit the exported files to rebuild the FLA files at your will.

Flash Decompiler Gold feature list
Free Version :

• Innovative preview window.
• Zoom in or zoom out the movie size
• Show the path of current movie
• Detailed movie information
• Background color can be selected
• File explorer can be set as list or report
• Browse and preview any flash before export
• Convert files to (*.swf) or (*.exe) format
• Export FLA data(7 times limited in evaluation period)

Full Version:

• Preview flash movie and every element before exporting
• Modify dynamic text field only
• Extract any element of the Flash movie such as shapes, morph shapes, images, sounds, videos, frames, fonts, buttons, sprites and ActionScripts.
• Export FLA data that can be rebuilt in native flash environment
• Convert flash files between exe and swf format
• Edit dynamic texts and replace images, add innovation to current flash movie
• Innovative preview window.
• Zoom in or zoom out the movie size
• Show the path of current movie
• Detailed movie information
• Background color can be selected
• File explorer can be set as list or report
• Browse and preview any flash before export
• Analyze SWF files to images, shapes, sounds, fonts, dynamic texts, buttons, sprites, scripts, and frames.