Fix Firefox error opening site shortcut or HTML file

Sometimes, when you click on an internet shortcut or double click on a local HTML file, Windows gives error — Windows cannot find [URL or path to file]. This error is caused by Dynamic Data Exchange (DDE) feature of Windows. You can disable DDE for HTTP/HTTPS protocols and the HTML files to fix this error. Here is how :

  1. Press the keyboard combination Windows logo key + R to bring up the Run dialog.
  2. Type regedit in the Run dialog and press Enter.
  3. In the Registry Editor, navigate to the following key,
  4. Select the ddeexec subkey and press the Delete key on your keyboard to delete it.

  5. Similarly, delete the ddeexec subkeys under the following Registry branches too :
    • HKEY_CLASSES_ROOTHTTPSshellopenddeexec
    • HKEY_CLASSES_ROOTFirefoxURLshellopenddeexec
    • HKEY_CLASSES_ROOTFirefoxHTMLshellopenddeexec
  6. You will find that Firefox is now able to open the internet shortcuts and the local HTML files.