Overview of File Extensions

Executable Files (.exe)

• Definition: Stands for executable files containing code or instructions for the processor to execute, or run, a program.
• Key Feature: Users can directly run these files.
• Examples:
  • notepad.exe - Opens Notepad.
  • chrome.exe - Opens Chrome.
  • taskmgr.exe - Opens Task Manager.

System Files (.sys)

• Definition: Contain important device drivers and hardware configurations for system operation.
• Function: Operate at a low level, communicating with the kernel and hardware.
• Examples:
  • win32k.sys
  • NTFS.sys
  • USBhub.sys

Dynamic Link Library Files (.dll)

• Definition: Contain code that multiple programs can access and use for common tasks.
• Purpose: Save time and resources by sharing code like showing dialog boxes.
• Examples:
  • shell32.dll
  • kernel32.dll
  • DNSapi.dll

Temporary Files (.tmp or temp)

• Definition: Created by applications or Windows to temporarily store information.
• Location: Stored in a designated folder containing a list of all temporary files.

Extensible Firmware Interface Files (EFI)

• Definition: Play a crucial role in the UEFI (Unified Extensible Firmware Interface) booting process.
• Function: Assist in starting a computer and determining which operating system to boot.

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