Question : web site name instead of file: uri

We have a Sharepoint 2007 server, one of the pages it puts up is a frame from a sub-site of the IIS server behind SP- the frame allows users to search data in a sql server.  Amongst the results is a link to a document.  In Internet Explorer the link shows as:

file: \\fileservername\subfolder\document.doc

but in Firefox 3.6.4 I get:

http://webservername/subsite/%5C%5Cfileservername%5Csubfolders%5Cdocument.doc

which of course gets a 404

where is the http://webservername/subsite coming from? is this a firefox issue, an IIS issue, a Sharepoint issue?  I've tried the local link solutions if Firefox but no dice.  

Answer : web site name instead of file: uri

Firefox won't recognize '\' as legitimate separators in filenames and  paths.  In addition, whether you use forward or back slashes, Firefox doesn't like the 'file://' protocol.  Considers it a security violation and does nothing.  I believe IE is the only browser that will recognize that link that way.