Right Click Issue With Send To Mail Recipient

One of our customers has a problem when trying to use this method.

When he right clicks a document (whether it's .pdf, .doc etc etc) and clicks "Send to", and then clicks "Send to mail...", the only thing that happens is that a empty dialog box appears, with the title "Error", and a confirmation box that says "OK".

When he then clicks "OK", nothing happens.

I played around a bit with default programs and associations, and ended up with removing the "Send to mail..." option completely.

I have tried to right click --> send to --> send to mail on my own computer, and it works flawlessly.

The user is running Windows 7 pro on a Dell Latitude E4300.

The default mail program is Lotus Notes v. 8.5, but Outlook is also installed and is associated with all e-mail options except the "mailto:" protocol and the ".mapimail" filetype. These two are associated with Lotus Notes.

The user wants to be able to send documents by using this method, and use it so Lotus Notes is the mail-program used for right click --> Send to --> Send to mail... option.

Is there any ideas around this problem? Please do not hesitate to ask about more info.