Read this forum thread for instructions on how to open a VTT file. Any text editor, such as Apple TextEdit for Mac and Microsoft Notepad for Windows, can be used to open and edit VTT files. A VTT file can easily dragged into any web browser to view its contents.
Use a VTT file as a subtitle track in VLC Media Player.
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Start the video you wish to use with the VTT file.
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Open the menu bar of VLC Media Player.
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After selecting Subtitles, click on Add Subtitle File.
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Select the saved .vtt file and enjoy the captioned video.