Some tools you can use to learn more about special files, like a Windows process explorer, add-in, anti spyware scanner, file converter or viewer.
Utilities
Security Task Manager shows all running Windows tasks including embedded hidden functions (e.g. keyboard or browser monitoring, autostart entry). A unique security risk rating indicates the likelihood of the process being potential spyware, malware, keylogger or a Trojan.
Spyware Doctor is one of the best malware & spyware removal utility that detects, removes and protects your hard disk from spyware, adware, trojans, keyloggers, spybots and tracking threats. Ideal supplement to Security Task Manager or WinTask.
Registry Mechanic safely cleans and repairs Windows registry problems. Thus you can prevent Windows crashes and error messages.
SpeedUpMyPC repairs and optimizes your system.
Remote Process Viewer shows all processes (programs, unknown malware, ...) currently running on remote computer in a Windows network.
Freeware
 Last Changed Files shows you the 100 recent changed files on your computer. You also can select a specific folder on your hard drive, exclude temporary files, cookies or any file types you want. |
 Windows Process Viewer is a free Windows task viewer that displays a description and users reviews. Identify your Windows processes running on your computer. |
 What are your largest files on your hard disk? See it with Largest Files Finder, a new freeware. If you need more free disk space, simply run that freeware and see what files can you delete to get more disk space. |