High Quality Content by WIKIPEDIA articles! The SWX Format (or simply SWX) is an open-source data format that Adobe Flash Player can interpret, as if it were a standard SWF. Since SWX is a subset of the SWF format, data is stored as SWF bytecode which is automatically interpreted by any version of Adobe Flash Player requiring no additional installation by the end user. An ActionScript API is also provided by the developers aiding integration of the SWX Format into Flash Websites and Rich Internet Applications.