FLA, Adobe Flash Animation (.fla)
The FLA Developer file format
Files saved in the FLA format have been created by the Adobe Flash program, a Flash animation software by Adobe Systems. FLA files are editable and contain an animation or whole movie in Flash. For web-usage, the FLA files are most commonly saved in another format, namely Adobe's SWF file format. FLA files for further editing can be found on the web, containing templates for simple animations or whole website designs.
Technical details of FLA files
FLA files are project files created in Adobe Flash or Adobe Flash Professional. Opening the file in the according program allows the user to further edit the Flash animation inside the project file or saving it in a web-ready format.