SWF format is used to store multimedia content and video games. It is very popular because it can be opened directly with any web browser compatible with Flash ...

If another program is trying to open it up and you want IE to open it up, you have to manually tell IE to open *.swf files by opening Windows Explorer and going to Tools->Folder Options->File Types, ...

if you are using a .swf to call the .flv accross domains, security settings in the swf player may not allow it.