Dans l'explorateur windows Menu Outils -> Options des dossiers... -> Onglet Affichage -> Ôter la coche Masquer les extensions des fichiers dont le type est connu.
Ensuite il s'agit vraiment d'un fichier source il te faut Macromedia Flash pour créer le fichier à publier.
Voici les différentes extensions :
.swf files are completed, compiled and published files that cannot be edited.
.fla files contain source material for the flash application. Flash authoring software can edit FLA files and compile them into .swf files. Proprietary to Macromedia, the FLA format in no sense counts as "open".
.as (or sometimes .actionscript) files contain ActionScript source code in simple source files. FLA files can also contain Actionscript code directly, but separate external .as files often emerge for structural reasons, or to expose the code to versioning applications.
.swd files are temporary debugging files used during Flash development. Once finished developing a Flash project these files are not needed and can be removed.
.asc files contain Server-Side ActionScript, which is used to develop efficient and flexible client-server Macromedia Flash Communication Server MX applications.
.flv files are Flash video files, as created by Macromedia Flash, Sorenson Squeeze, or On2 Flix.
.swc file format for distributing components; it contains a compiled clip, the components ActionScript class file, and other files that describe the component.
.swt files templatized SWF files used by Macromedia Generator.
.flp XML file with the file extension .flpfor example, myProject.flp. The XML file references all the document files contained in the Flash Project. Flash Projects allow you to group multiple, related files together to create complex applications
Source : http://en.wikipedia.org/wiki/Macromedia_Flash
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