Cannot change color mystore in Parameters

Parameters:The parameter file templatesgk_mystoreparams.ini is unwritable!

Hi
Try change file rules to 777.

I change in com_templates/controller

// Try to make the params file writeable
if (!$ftp['enabled'] && JPath::isOwner($file) && !JPath::setPermissions($file, '0755')) {
JError::raiseNotice('SOME_ERROR_CODE', JText::_('Could not make the template parameter file writable'));
}

$return = JFile::write($file, $txt);

// Try to make the params file unwriteable
if (!$ftp['enabled'] && JPath::isOwner($file) && !JPath::setPermissions($file, '0777')) {
JError::raiseNotice('SOME_ERROR_CODE', JText::_('Could not make the template parameter file unwritable'));

I'm working with xampp

Try to change them using for example Total Commander.