They may also occur in programs, commonly browser games, using ActionScript. Originating with FutureWave Software, then transferred to Macromedia, and then coming under the control of Adobe, SWF files can contain animations or applets of varying degrees of interactivity and function. SWF ( / ˈ s w ɪ f/) is a defunct Adobe Flash file format that was used for multimedia, vector graphics and ActionScript. Application/, application/x-shockwave-flash Īdobe Flash (formerly Macromedia Flash and FutureSplash), sometimes labeled Shockwave Flash Object.