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32-bit and 64-bit Windows:
Visit: http://windows.microsoft.com/en-IE/windows7/32-bit-and-64-bit-Windows-frequently-asked-questions

How can I edit Shockwave Flash object?
To edit the file you will need the .fla file that the .swf was made from.

Another option is to get .swf de-compiler and make a .fla file from the .swf and then use Flash to edit and re-publish the movie.

Source: www.webmasterworld.com