| Click MIME Types |
With the Virtual Directory created earlier selected, in the center panel double click the MIME Types button: 
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| Add or Edit .m3u8 |
Add if it does not exist, or find and edit the following: File name extension: .m3u8 MIME type: application/x-mpegURL 
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| Add or Edit .vtt |
Add if it does not exist, or find and edit the following: File name extension: .vtt MIME type: text/vtt 
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Adding MIME Types for 3.3
Updated on December 9th, 2022