text box action to open excel file

Hi All,

In SSRS 2008 R2, I try to link a text box to open an excel file, but failed.

textbox -> properties -> Action -> Go to URL -> Expression ="\\ServerName\Path\Filename.xlsx"

It does not work at all, but works file for pdf file, I am not sure what's the problem, also, how to open it in a separate window and read only?

Thanks a lot for help.

Ling