Flash Decompiler can now convert Adobe Flex files. Remember, that Flex files are created by Adobe Flex Builder, therefore they cannot be converted into FLA. Flash Decompiler will create a Flex Builder project, and you will need Adobe Flex Builder software to edit such project. You will see a pop-up window with this information before converting Flex files:
For your convenience, while working with a file, you can see whether it is a Flash or Flex file. There will be
or
icon to the left of the file name in My tasks list.
Note 1: You are able to change conversion settings for Flex projects. However, only ActionScript settings are applicable to Flex files. Customization of the rest of the settings (Motion tweens, Objects and Text) won't influence the resulting file.

Note 2: Remember, that demo version of Flash Decompiler doesn't convert Flex files. But you are able to preview ActionScripts stored in them. To be able to convert Flex files into their source code, you must obtain a license and register your copy of Flash Decompiler.