Ensure your extraction software is up to date; older versions of decompression tools may not support the latest .7z headers.
If you intend to play on Windows 10/11, it is highly recommended to move the extracted files into the /data folder of an OpenTTD installation to enjoy high-resolution support and multiplayer. TTO.7z
If running the original Windows version, you may need compatibility mode set to "Windows 95." Ensure your extraction software is up to date;