What is a sub file and how do I open a sub file?
Files with the .sub extension are essentially text documents containing subtitle details of digital videos. Videos that will use these SUB files should be saved in the DivX or MicroDVD format, and there are other video formats with compatibility support for these SUB files. Aside from the subtitle text for a particular video, details of specific cue points must also be included in a SUB file. These cue points instruct the application used to view the video about the correct timing sequences specific subtitles should be displayed. This means video files developed with an associated file in the SUB format finds and use the associated SUB file when the user enables subtitles during video playback. MPlayer, both versions for Mac and Microsoft Windows, provide compatibility support for digital videos that use SUB files, while popular text editors like Microsoft Notepad and Microsoft WordPad can be used to open and view the content of a SUB file.
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How to open sub file on YoutubeHow to open sub file on Wikipedia
How to open sub file on Microsoft.com