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,
    HKEY_CLASSES_ROOTHTTPshellopen
  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.
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