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 built-in file manager in Windows is called Windows Explorer. It's where you browse, preview or manage the files or folders in Windows operating system. Windows Explorer can also be used to search or transfer files from or to another partition, external drive or another computer in the network or in remote location.