Uploading swf to wordpress


I need to embed flash to WordPress multisite sub-site. It doesn’t work from add media. When I try to add .swf, I am getting this:

Sorry, this file type is not permitted for security reasons.

Is this normal. In many forums, I read that the file should be added to media first.

I tried a couple of plugins like kimili, but still couldn’t succeed.

What is the most practical way to place a flash movie in a page or post.