' this code assumes that you have used this Imports statement' Imports Microsoft.Win32Function IsExcelInstalled() As Boolean ' Define the RegistryKey objects for the registry hives. Dim regClasses As RegistryKey = Registry.ClassesRoot ' Check whether Microsoft Excel is installed on this computer, ' by searching the HKEY_CLASSES_ROOTExcel.Application key. Dim regExcel As RegistryKey = regClasses.OpenSubKey("Excel.Application") If regExcel Is Nothing Then IsExcelInstalled = False Else IsExcelInstalled = True End If ' Always close Registry keys after using them. regExcel.Close()End Function' ExampleIf IsExcelInstalled() Then Console.WriteLine("Microsoft Excel is installed")Else Console.WriteLine("Microsoft Excel is not installed")End If
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