REGEDIT4

[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Excel\Options]
"DefaultFormat"=dword:00000038

[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word\Options]
"DefaultFormat"="Doc"

[HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\PowerPoint\Options]
"DefaultFormat"=dword:00000000