I have a similar issue: inherited SWF without source from previous contractor who lost on recompete. Company purchased Sothink and decompiled SWF to both FLA and Flex. I created a new Flex project in Flash Builder Premium, but can't get this to compile. Decompiled FLA is also not useful. Lots of AS3 files. What is the secret sauce to recovering SWF in a usable format in Flash Premium Builder? I tried compiling directly in Flex but no joy. Can someone provide a step-by-step for using Premium Builder and/or Flex from DOS with decompiled Sothink source files? Many thanks.