Flasm is an interesting tool, totally free, for all those users who usually work with flash applications, as it is a flash assembler and disassembler that allows you to make changes to a SWF file.
With Flasm you can open a SWF file, view it or disassemble it completely to obtain the original flash file, including all the timelines and the events associated with each moment. Once you make the changes you deem appropriate, you can recompile and assemble it. It allows you to work with Flash MX 2004.
In this way, with Flasm you can make all the changes you want within the SWF and adjust the actions to what you want (replacing all the previous actions).
You can free download Flasm 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.