An EXE file is a common file extension for executable files in Windows operating systems. It contains program code that can be directly executed by the operating system to perform a specific task or run an application. The file contains machine code instructions, resources (like images and icons), and metadata necessary for the operating system to load and execute the program. When you double-click an EXE file, the operating system loads the program into memory and begins executing the instructions. EXE files are a primary means of distributing and running software on Windows. They can range from small utility programs to large and complex applications. Due to their nature, EXE files can also be a vector for malware, so it's crucial to only run EXE files from trusted sources. The internal structure of an EXE file follows a specific format, including a header that identifies the file as an executable and provides information about the program's entry point and other essential details. The format has evolved over time, with newer versions supporting features like 64-bit architecture and enhanced security measures.