Convert pk3 to x3d

What is the difference between .pk3 and .x3d?

Description: A PK3 file is an archive used by the Quake 3 and Quake Live gaming engines. It stores game data such as textures, sounds, models, and maps in a compressed format. PK3 files can be opened and extracted with WinZip, WinRAR, or 7-Zip on Windows, and with The Unarchiver on macOS.; X3D (Extensible 3D) is a royalty-free open standard file format used to represent 3D computer graphics. It is used to store and interchange 3D model data, including surface geometry, color, animation, and metadata. X3D files are built on the XML standard, and can be viewed and edited with a variety of 3D modeling programs.