The PE format mentions less familiar executable types such as SCR (Screensavers), CPL (Control Panel Applets), SYS, MSSTYLES, BPL, and DPL. Which of the following is a less familiar type?

The PE format mentions less familiar executable types such as SCR (Screensavers), CPL (Control Panel Applets), SYS, MSSTYLES, BPL, and DPL. Which of the following is a less familiar type?

• A. EXE
• B. DLL
• C. SCR
• D. SYS

Answer: (C)

The concept being tested is recognizing Windows PE file types by their extensions and how specialized ones differ from the everyday executables. SCR stands for a screen saver file in Windows. It is a PE executable, just like an EXE, but it’s specifically used as a screen saver and is invoked by the system when you select a screen saver, not as a normal application. Because screen savers are a narrow, less-common use case, SCR is less familiar to most users compared to the standard EXE, DLL, or SYS types (the latter two being common: DLLs are libraries and SYS files are drivers). Therefore, SCR is the least familiar type among the options.

The concept being tested is recognizing Windows PE file types by their extensions and how specialized ones differ from the everyday executables. SCR stands for a screen saver file in Windows. It is a PE executable, just like an EXE, but it’s specifically used as a screen saver and is invoked by the system when you select a screen saver, not as a normal application. Because screen savers are a narrow, less-common use case, SCR is less familiar to most users compared to the standard EXE, DLL, or SYS types (the latter two being common: DLLs are libraries and SYS files are drivers). Therefore, SCR is the least familiar type among the options.