The .prg file extension is a versatile format primarily used to denote executable program files or script files across several distinct computing environments. Most notably, it is the standard file format for programs on 8-bit Commodore home computers, such as the Commodore 64 and VIC-20. In this context, a .prg file is a binary container where the first two bytes indicate the memory address where the program should be loaded. Beyond retro computing, the .prg extension is extensively used in database management systems like dBase, FoxPro, and Clipper. In these environments, the file contains procedural source code or scripts used to manipulate data and automate database tasks. Furthermore, the extension is found in specialized industrial applications, such as CNC (Computer Numerical Control) machine programming, where it holds instructions for automated manufacturing tools. Because the term 'program' is broad, the internal structure of a .prg file varies significantly depending on the software that created it, ranging from raw binary machine code to plain-text source scripts.