Does PostedFile.FileName work differently in .Net 4.0?
===

I'm working on an ASP.Net site which allows users to link documents using a UNC path.  This site is used by a customer of ours for internal processes, so all users on their domain should have access to the UNC path.

When a user wants to add a linked document, they select the file using a FileUpload control.  Previously in .Net 2.0, the control's PostedFile.FileName property returned the filename and the full UNC path.  Now we are using .Net 4.0 and it only returns the filename.

**Here's my main question:**  Does PostedFile.FileName work differently in .Net 4.0 compared to 2.0?  

If not, what else could cause this problem?
