Autom. Dateiöffnen scheitert an Leerzeichen trotz "%1"

[JayRZay]

Ich Depp. Entschuldigung. Das hätte ich vielleicht mal erwähnen sollen.

Delphi-Quellcode:

function InstallExt(Extension, ExtDescription, FileDescription,
OpenWith, ParamString: string; IconIndex: Integer = 0): Boolean;
var
  Reg: TRegistry;
begin
  Result := False;
  if Extension <> '' then
  begin
    if Extension[1] <> '.' then
      Extension := '.' + Extension;

    Reg := TRegistry.Create;
    try
      Reg.RootKey := HKEY_CLASSES_ROOT;
      if Reg.OpenKey(Extension, True) then
      begin
       Reg.WriteString('', ExtDescription);
       if Reg.OpenKey('\' + ExtDescription, True) then
       begin
         Reg.WriteString('', FileDescription);
         if Reg.OpenKey('DefaultIcon', True) then
         begin
           Reg.WriteString('', Format('%s,%d', [OpenWith, IconIndex]));
           if Reg.OpenKey('\' + ExtDescription + '\Shell\Open\Command', True) then
           begin
             Reg.WriteString('', Format('"%s" "%s"', [OpenWith, ParamString]));
             Result:=True;
           end;
         end;
       end;
     end;
  finally
    Reg.Free;
  end;
  end;
end;