Files that contain the .dir file extension are movie or animation project files that have been created by the Macromedia Director software application.
The Macromedia Director software program is used to create and edit videos. The DIR files that are used by the program include project resources, scripting code and a timeline as well as links to other associated media files. The DIR files are the project file and are not usually distributed to the end user as the actual movie file.
A DIR file helps determine how a movie is played within a media player. Macromedia, the company that created the Director program and the DIR file format, was taken over by Adobe in 2005.
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