Type Notepad in the Start Search box, and then press Enter.
Copy the following code into Notepad.
"Windows Registry Editor Version 5.00 [HKEY _ Class _ Root \. Xml]@="xmlfile ""content type "="text/xml"
[HKEY _ LOCAL _ MACHINE \ SOFTWARE \ Classes \。 Xml]@="xmlfile ""content type "="text/xml" "
Click File-Save As in the menu bar.
Save the file on the desktop, type "1.reg" in the file name box, and click "Save".
Double-click the reg file and import the registry information, and you can solve it.