Typically, such files are extracted and placed within the X-Plane 11\Custom Scenery folder. Installation often requires modifying the scenery_packs.ini file to ensure correct rendering priority.
did you download the file from (e.g., a specific forum, file-sharing site)? taiwan-xp11.rar
It is likely designed to enhance the default X-Plane 11 environment with improved terrain, textures, or landmarks for the area [1]. Typically, such files are extracted and placed within