Link/URL to locally stored office document?

Hello,

is there a way to create a field that stores a link to locally stored office document (local fileserver, local client).

I tried the fieldtype internetaddress (or is it called webadress in the english ui?) and entered the syntax file:///c:\temp\report.xlsx (where c:\temp\report.xlsx is just an example). But that didn't work. Any Silverlight restrictions on that, since "file:///" could be used in html as a link ref?

Regards

Udo