Here are waht I did:
I have 3 bmp images with 640x480.
File names are MAPC078, MAPC079,MAPC080
I cant import swf file to Editor
>I was using "Flash CS4" to import these 3 image files into flash stage.
>it poped up a window, I click yes.
>Then 3 images showed on the stage, and Timeline showed 3 keyframe in frame 1, 2 and 3
>Also, all 3 bmp images can be found in Library too
>then i select all bmp image files in the library, and right click them
and select the properties to change the "base class" as "flash.display.MovieClip" (I also tried "flash.display.Sprite"
>Then Export to image in .swf
(Also tried Export to movie in .swf)
(Also tried publish, in .swf)