Most Mandarin varieties have four tones. The final stops of Middle Chinese have disappeared in most of these varieties, but some have merged them as a final glottal stop. Many Mandarin varieties, including the Beijing dialect, retain retroflex initial consonants, which have been lost in southern dialect groups.
explorer.exe is a system process that is needed for your PC to work properly. It should not be removed. Check your system now to identify unused processes that are slowing down your computer. The explorer.exe file is an executable file for Windows Explorer.
The explorer.exe file was created to replace the Windows 3.x File Manager, which is the older version of the application embedded on previous versions of the MS Windows environment. The explorer.exe file is executed when the user double-clicks on the My Computer desktop icon and the one found in the Start menu. The explorer.exe file was initially used only to navigate or browse files, but as newer versions of Windows were released, it evolved to being a file management system that is task-based.