If you have misplaced your original FLA file (or Flex source project) and only compiled SWF is available, it is no problem to restore original FLA (or Flex source). Flash Decompiler Trillix for Mac will decompile SWF video and solve this problem in a couple of moments.
SWF Decompiler for Mac is the right tool if you want to decompose SWF file into its elements and browse through its structure. You can easily extract any of initial SWF elements into various formats.
SWF Decompiler Mac interface has a useful SWF Resource Panel since version 4. You can look through each group of SWF file elements, preview each of them in Flash Decompiler and extract any of them.