@MaxDuellio the AVI container is not supported by Roku. There is no way to natively play AVI files. The only solution is to use a media server solution, such as Plex, Emby, or a basic DLNA server like Serviio. Plex and Emby both provide a channel for Roku devices that provide a nice user interface. Using a DLNA server means you use the Roku Media Player, which is a nice if basic player. All three solutions I mentioned are free, but require setting up a media server on a computer connected to your home network.
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