Win32Exception

Using Visual Studio 2008.  The user's PC is running Windows 7.

I have this code fragment in a data grid view cell double-click event.
System.Diagnostics.Process process = new System.Diagnostics.Process();
StringBuilder URI = new StringBuilder();
URI.Append("http://www.fedex.com/Tracking?tracknumbers=");
URI.Append(TTNo.Substring(1, TTNo.Length - 1));
URI.Append("&cntry_code=us&language=english&clienttype=ivother&");
process.StartInfo.FileName = URI.ToString();
process.Start(); 

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A user just began getting the error below:
 
System.ComponentModel.Win32Exception: No application with the specified file for this operation at System.Diagnostics.Process.StartWithShellExecute(ProcessStartInfoStartInfo) at System.Diagnostics.Process.Start() at myapp.dgvTracking_CellDoubleClick(Object sender, DataGridViewCellArgs e)
 
This has worked for several years without a problem. The user is not aware of any updates to his system.
waverazorAsked:
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jmcmunnCommented:
This error is generally caused by the user not having a default web browser set on their machine.  Perhaps they previously used a browser that was recently uninstalled, or else the default browser got reset or something due to a software update.

If you have the user get into a web browser and set it as default, or else associate a default program to open web addresses (htm, html) then the error should go away.
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