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Get names of installed mail-clients

{ Get names of installed Mail-Clients. Namen der installierten Mail-Clients ermitteln. } uses Registry; function GetInstalledMailClients(AList: TStrings): Boolean; const RegClientsRoot = '\SOFTWARE\Clients'; RegClientsMail = '\Mail'; RegClientsOpenCmd = '\shell\open\command'; var reg: TRegistry; begin Result := True; try AList.Clear; reg := nil; reg := TRegistry.Create; try with reg do begin CloseKey; RootKey := HKEY_LOCAL_MACHINE; if OpenKeyReadOnly(RegClientsroot + RegClientsMail) then if HasSubKeys then GetKeyNames(AList); end; finally if Assigned(reg) then reg.Free; end; except Result := False; end; end; procedure TForm1.Button1Click(Sender: TObject); begin GetInstalledMailClients(ListBox1.Items); end;