FireFox is changing my hyperlink path

So just had this reported by another user. We have a page that lists out uploaded documents, the paths are stored in the database as relative path to a virtual directory
on my page i have the following control to display those links.
<asp:HyperLink ID="hypPDF" runat="server" NavigateUrl='<%# Bind("filepath") %>' Text='<%# Eval("description") %>' Target="_blank"></asp:HyperLink> The path stored in the table is formatted like so
\Projects\Documents\electrical\Scan_Doc0001.pdf In IE, when the page loads and you mouse over the link you can clearly see that the full url is correct and formatted and works.
http://mysite.com/Projects/Documents/electrical/Scan_Doc0001.pdf In FF, ...