//Open with the 'Windows picture and fax viewer':
System.Diagnostics.Process.Start("C:\\Windows\\system32\\rundll32.exe ",
"C:\\Windows\\system32\\shimgvw.dll,ImageView_Fullscreen " + _filename);
//Open with the 'Windows picture and fax viewer':
System.Diagnostics.Process.Start("C:\\Windows\\system32\\rundll32.exe ",
"C:\\Windows\\system32\\shimgvw.dll,ImageView_Fullscreen " + _filename);