An "Index Of" page appears due to a specific server configuration setting. By default, secure web servers should disable directory browsing.
: For .avi files that are not adult in nature, consider stock footage websites. Many offer free or paid clips in .avi format for various uses.
This method is often used to find "open directories"—servers that have been misconfigured to allow anyone to browse and download their files. In this specific case, it's being used to look for video files without going through a standard website interface. Risks and Considerations