Internet Explorer needs to be set as the associated application for opening XML files on your computer.
1. Right-click on any XML file in Windows Explorer.
2. Select Open with – Choose default program…
3. Select Internet Explorer in the list,
a. For Windows 7, also check "Always use the selected program to open this kind of file", then click OK.
b. For Windows 8, check “Use this app for all .xml files”.