The .ssa file extension is most commonly associated with the Sub Station Alpha video subtitle freeware. This application is used to create subtitles for video files. The SSA files contain the subtitles that are created with the software. These files are saved in text format and are used by a variety of video editing applications.
The .ssa file extension is also used for Empire Earth custom assets files and Visual SourceSafe backup archive files.
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If you have additional information about the SSA file format or software that uses files with the SSA suffix, please do get in touch - we would love hearing from you.