REGEDIT4

[-HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec]

[HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec\Application]
""="FIREFOX"

[-HKEY_CLASSES_ROOT\https\shell\open\ddeexec]

[HKEY_CLASSES_ROOT\https\shell\open\ddeexec\Application]
""="FIREFOX"

[-HKEY_CLASSES_ROOT\ftp\shell\open\ddeexec]

[HKEY_CLASSES_ROOT\ftp\shell\open\ddeexec\Application]
""="FIREFOX"

[-HKEY_CLASSES_ROOT\gopher\shell\open\ddeexec]

[HKEY_CLASSES_ROOT\gopher\shell\open\ddeexec\Application]
""="FIREFOX"