Thanks a lot for your answers, Oleg. Regarding 2), the -swf-version option Here's the first line of output of the swfdump tool applied to a file compiled with the 4.6 SDK: <swf xmlns='http://macromedia/2003/swfx' version='14' framerate='24' size='16000x12000' compressed='true' >
Here's the same line of output for an SWF compiled using the 4.5.0 SDK: <swf xmlns='http://macromedia/2003/swfx' version='10' framerate='24' size='16000x12000' compressed='true' > The @version attribute and the values here refer to the SWF header version, as described in the SWF file format specification, Chapter 2. 14 stands for FP 11.1, 11 for FP 10.2, 10 for FP 10.1 Using the -target-version option for the compiler, the FP versions can be targeted. Therefore the -swf-version option should not be related to the FP version (which means APIs or interfaces in the playerglobal.swc), but to the file format SWF10. That's at least my understanding. Thanks, Raju