Cannot Open XML Files in Internet Explorer
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Problem

Before installing Oxygen XML Editor I had no problems opening XML files in Internet Explorer. Now when I try to open an XML file in Internet Explorer, it opens the file in Oxygen XML Editor. How can I load XML files in Internet Explorer again?

Cause

XML files are opened in Oxygen XML Editor because Internet Explorer uses the Windows system file associations for opening files and you associated XML files with Oxygen XML Editor in the installer panel called File Associations. Therefore, Internet Explorer opens XML files with the associated Windows application.

Solution

To open XML files in Internet Explorer, you have to set Internet Explorer as the default system application for XML files. For example, you can do so by following this procedure:
  1. Right-click the XML file in Windows Explorer and select Open With > Choose Default Program.
  2. Expand the section with the down-arrow and select IE in the list of applications.
  3. Select the Always use the selected program option.
If XML files are still not opened in Internet Explorer, create a file named revert.vbs with the following content:
  function revert()
    Set objShell = CreateObject("WScript.Shell")
    objShell.RegWrite "HKCR\.xml\", "xmlfile", "REG_SZ"
    objShell.RegWrite "HKCR\.xml\Content Type", "text/xml", "REG_SZ"
  end function
                        
  revert()
Then run the following command from a command line:
wscript revert.vbs