How to find if the .dwfx file has respective Viewer

Hi All,

         I have a .dwfx extension file which will be uploaded in my application path say "Files/DWFX/Filename.dwfx".

Now i want the file top be viewed in browser on button click. When clicking View if the file cannot be viewed due to "dwfx Viewer" missing a warning should be displayed.

Now in IE if i open the File giving the Physical Path like "D:/ApplicationName/Files/DWFX/Filename.dwfx" the screen displays as below

Additional Content Available: This DWF file contains extended content that cannot currently be displayed in this application.

To view the entire contents of the file download the free Autodesk Design Review from: http://www.autodesk.com/designreview-download

Autodesk Design Review Free DWF™ viewing, measure, and markup

Thanks

Mayil