Blogger does not support flash files.
The only solution for having a flash on blogger is that you must upload the .swf flash file to another host server (you can use google sites it's free) and then use embed code :
<object width="300" height="250">
<param name="movie" value="link to your flash">
<embed src="link to your flash" width="300" height="250">
</embed>
</object>
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