Porque funciona no Firefox e no IE não

Vinicius, o problema está na nomenclatura do seu codigo html

>

<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="[http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0"](http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0) width="550" height="400">

 <param name="movie" value="**Preloader.swf**" />

 <param name="quality" value="high" />

 <embed src="**preloader.swf**" quality="high" pluginspage="[http://www.macromedia.com/go/getflashplayer"](http://www.macromedia.com/go/getflashplayer) type="application/x-shockwave-flash" width="550" height="400"></embed>

</object>

o Internet Explorer nao carrega o swf pela tag embed e sim pela tag <param name="movie" value="**Preloader.swf**" />

observe a diferença entre:

Preloader.swf e preloader.swf