How to turn off 'Open With' dialog box when clicking on unassociated file extension

[Graham Prentice]

We have terminal server clients in a locked down environment.
When they click on a file with an extension not recognised by the system,
a dialog box will open asking them to pick from any loaded apps on the
server or to go out on the web looking for any other apps that might do. We
don't want the users running unathorized apps.
How do you turn this off? Couldn't see anything in GPO. (I may have missed
it though)
Win2003 Terminal Services.
Graham

 

[Glenn L]

I don't know if it is possible, but my first thought is to get Tweakui (MS
freebee tool) and see if it can perform the neccessary registry edits.

 

[Graham Prentice]

Found HKCU\Software\MS\Win\CV\Policy\Explorer\NoFileAssociate=1 DWORD
disables the user's ability to change the association.
Also HKCR\Unknown allows changing the whole server and how it associates -
but admins would get hit as well - not really what I want.
I'll keep looking.
Graham

 

[Graham Prentice]

Found HKCR\Applications\app.exe put an empty string 'NoOpenWith' and these
apps will not be available in the 'open with' menu.
Graham