REGEDIT4

[HKEY_CLASSES_ROOT\.xhtml]
@="htmlfile"
"Content Type"="text/html"

[HKEY_CLASSES_ROOT\.xhtml\ShellEx]

[HKEY_CLASSES_ROOT\.xhtml\ShellEx\{BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}]
@="{EAB841A0-9550-11cf-8C16-00805F1408F3}"