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.
There is a virus hoax that advises customers to delete a valid Windows file that is named Jdbgmgr.exe. This file is the Microsoft Debugger Registrar for Java. If you receive the e-mail message that is listed in the More Information section of this article, delete the e-mail message and do not forward it to others.