*. html
It is an HTML Wrapper. Flash generates the HTML code that references to its Shockwave file.
*.exe
It is a stand-alone projector file for Windows. It cannot be modified.
*.app It is a stand-alone projector file for Mac. It cannot be modified.
For example,
File > Publish to export movies out of Flash
By default, it will export to .swf format, and
Will generate the HTML codes that reference the Shockwave file. e.g.