What is a .EXI file?
An EXI file is a special type of file used by the YouTube app on Android devices. When you download a video on the YouTube app to watch it without an internet connection (offline), the app creates an EXI file. This file acts like a table of contents or an index. It helps the YouTube app find and play the video you've downloaded. The EXI file itself doesn't contain the video or audio of your downloaded YouTube video. Instead, it has information that the YouTube app needs to locate and play the video on your device. Because of its specific purpose, you're not supposed to open EXI files yourself. They're just meant for the YouTube app to use.
If you're using an Android device and have the YouTube app installed, that's all you need to work with EXI files. There's no need for any other program to open or use these files. The YouTube app automatically handles everything related to EXI files, including creating them when you download a video and using them to play your downloaded videos offline.
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