вот что написано в хелпе про
MovieClipLoader.loadClip
Цитата:
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Loads a SWF, JPEG, progressive JPEG, unanimated GIF, or PNG file into a movie clip in Flash Player while the original movie is playing. If you load an animated GIF, only the first frame is displayed. Using this method you can display several SWF files at once and switch between SWF files without loading another HTML document.
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т.е. кроме jpg, еще gif и png.