Windows System Files Extensions - What are windowssystem files and how do I open a windowssystem file?

What are windowssystem files and how do I open a windowssystem file?

File Type Category File Format
.cpl Windows System Files Windows Control Panel Item
.cur Windows System Files Windows Cursor
.deskthemepack Windows System Files Windows 8 Desktop Theme Pack File
.dmp Windows System Files Windows Memory Dump
.efi Windows System Files Extensible Firmware Interface File
.elf Windows System Files Executable and Linkable Format File
.etl Windows System Files Microsoft Event Trace Log File
.inf_loc Windows System Files Windows Driver Information Cache File
.lnk Windows System Files Windows File Shortcut
.manifest Windows System Files Windows Application Manifest File
.mdmp Windows System Files Windows Minidump
.mui Windows System Files Multilingual User Interface File
.nbh Windows System Files ROM Update Utility Image File
.pol Windows System Files Windows Policy File
.regtrans-ms Windows System Files Registry Transaction Log File
.scr Windows System Files Windows Screensaver
.sys Windows System Files Windows System File