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.
In the Microsoft Windows operating system, the explorer.exe file runs and has a graphical user interface that you can see when you are opening hard drives or files. Sometimes, the graphical user interface of the explorer.exe file is referred to as Windows GUI shell or Explorer.