Files that contain the .ass file extension are most commonly associated with the SubStation Alpha software program. These ASS files contain subtitle files that are created by the software application.
The ASS file format allows for the formatting and styling of subtitle text and is commonly used in Karaoke software. It is one of the few subtitle applications that allows for the formatting and stylizing of subtitle text and, as such, is very popular in Anime and Karaoke projects.
While ASS files are similar to other subtitle files in many ways, the ASS file format offers more advanced subtitle formatting than similar file formats such as the SRT file format.
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If you have additional information about the ASS file format or software that uses files with the ASS suffix, please do get in touch - we would love hearing from you.