File|send to|eMail recipient – not valid

I run a network based on W2K and Office 2000 along with Lotus Notes 5.0.7 as mail client.

On most of the PC’s – inside the Office programs – the function File | Send to | Email recipient – works OK, adressing a start/change to Notes starting a new mail with the active office file as an enclosure.

But – on a few of the PC’s – the choice “Email recipient” is not a valid choice.
On these few PC’s anywhere else in windows using the rightclick context menu chioce “Send to Email recipient” work OK adressing Notes correctly.
I have checked the Internet properties in the control panel | programs – and for email, Notes is chosen correctly.

I’w totally lost. Anyone for a solution ?

Can it be that Notes was installed after Office instead of before or the other way round. If so – which order is correct ?