[xwiki-users] Inserting links to files on network drives

Hi, Managers and other users at my company like to update excel spreadsheets on work progress. These spreadsheets get updated quite frequently by many users so attaching them to the wiki isn't so practical because of the overhead of checking checking the attachments in and out. So I'd like to make it easier for managers to put in links to these spreadsheets from a wiki page: So the users can (from the wiki WYSIWYG editor) browse to the spreadsheet files and insert them without having to workout the syntax e.g. file:// and the network drive, etc. How might I go about editing/adding macros to do this? Thanks. Regards, Richard