...get the start command for a installed Mail-Client?

{
  Kommando ermitteln, mit welchem ein bestimmter,
  installierter Mail-Client gestartet werden kann.

  Get command to start a specific, installed Mail-Client.
}

uses
  Registry;

function GetMailClientOpenCommand(AMailClient: string): string;
const
  RegClientsRoot = '\SOFTWARE\Clients';
  RegClientsMail = '\Mail';
  RegClientsOpenCmd = '\shell\open\command';
var
  reg: TRegistry;
begin
  Result := '';
  reg := TRegistry.Create;
  try
    with reg do
    begin
      CloseKey;
      RootKey := HKEY_LOCAL_MACHINE;
      if OpenKeyReadOnly(RegClientsroot + RegClientsMail +
        '\' + AMailClient +
        RegClientsOpenCmd) then
        Result := reg.ReadString('');
    end;
  finally
    if Assigned(reg) then reg.Free;
  end;
end;

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