Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\SOFTWARE\Classes\callto]
@="URL:callto"

[HKEY_CURRENT_USER\SOFTWARE\Classes\callto]
"URL Protocol"=""

[HKEY_CURRENT_USER\SOFTWARE\Classes\tel]
@="URL:tel"

[HKEY_CURRENT_USER\SOFTWARE\Classes\tel]
"URL Protocol"=""