ça y ai ça marche j'ai le meme probleme et j'ai trouvé une solution, les utilisateurs ne sont pas prompté.
il faut modifier les clés de registre sous HKCU/Software/classes et y faire les associations qui vont biens.
On a mis ça en place avec un vbs dans le script de login.
Voici le code
bye
Set WshShell = WScript.CreateObject("WScript.Shell" )
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\.htm\", "MyHTMLfile"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\.html\", "MyHTMLfile"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\.mht\", "MyHTMLfile"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\.mhtml\", "MyHTMLfile"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\.shtml\", "MyHTMLfile"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\.url\", "MyInternetShortcut"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\http\Shell\", "MyHTMLFile"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\http\Shell\MyHTMLFile\Command\", chr(34)&"C:\Program Files\Internet Explorer\IExplore.exe"&Chr(34)&" "&Chr(34)&"%1"&Chr(34)
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\https\Shell\", "MyHTMLFile"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\https\Shell\MyHTMLFile\Command\", chr(34)&"C:\Program Files\Internet Explorer\IExplore.exe"&Chr(34)&" "&Chr(34)&"%1"&Chr(34)
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\MyHTMLfile\Shell\Open\Command\", chr(34)&"C:\Program Files\Internet Explorer\IExplore.exe"&Chr(34)&" "&Chr(34)&"%1"&Chr(34)
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\MyInternetShortcut\Shell\Open\Command\", "rundll32.exe shdocvw.dll,OpenURL %l"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\MyInternetShortcut\IsShortcut", ""
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\MyInternetShortcut\NeverShowExt", ""
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\MyInternetShortcut\EditFlags", "00000002","REG_DWORD"
WshShell.RegWrite "HKEY_CURRENT_USER\Software\Classes\MyMHTMLFile\Shell\Open\Command\", chr(34)&"C:\Program Files\Internet Explorer\IExplore.exe"&Chr(34)&" "&Chr(34)&"%1"&Chr(34)