简单修改几步，即可让magento的联系我们可以上传文件作为发送邮件的附件。

步骤：

1. 修改模板文件“template/contacts/form.phtm”,

form修改为

<form action= "<?php echo $this->getFormAction(); ?>" id= "contactForm" method="post" enctype= "multipart/form-data" >

再在comment文本框的下面添加

<li>
    <label for="attachment"><?php echo Mage::helper('contacts')->__('Attachment') ?></label>
    <div class="input-box">
        <input name="MAX_FILE_SIZE" type="hidden" value="2000000" />
        <input name="attachment" id="attachment" class="input-text" type="file" />
    </div>
</li>

2. 添加控制器逻辑代码。

自定义一个新模块，在新模块的配置文件/app/code/local/CsjCg/Customcontact/etc/config.xml里定义如下：

<frontend>
    <routers>
        <contacts>
            <args>
                <modules>
                    <csjcg_customcontact before="Mage_Contacts">CsjCg_Customcontact</csjcg_customcontact>
                </modules>
            </args>
        </contacts>
    </routers>
</frontend>

模块的controller文件/app/code/local/CsjCg/Customcontact/controllers/IndexController.php

<?php
/**
 *
 * @category    Mage
 * @package     Mage_Adminhtml
 * @author      Sjolzy <chen@sjolzy.cn>
 */
require_once Mage::getModuleDir('controllers', 'Mage_Contacts') . DS . 'IndexController.php';
class CsjCg_Customcontact_IndexController extends Mage_Contacts_IndexController
{
    public function postAction()
    {
        $post = $this->getRequest()->getPost();
        if ( $post ) {
            $translate = Mage::getSingleton('core/translate');
            /* @var $translate Mage_Core_Model_Translate */
            $translate->setTranslateInline(false);
            try {
                $postObject = new Varien_Object();
                $postObject->setData($post);
 
                $error = false;
                if (!Zend_Validate::is(trim($post['name']) , 'NotEmpty')) {
                    $error = true;
                }
                if (!Zend_Validate::is(trim($post['comment']) , 'NotEmpty')) {
                    $error = true;
                }
                if (!Zend_Validate::is(trim($post['email']), 'EmailAddress')) {
                    $error = true;
                }
                if (Zend_Validate::is(trim($post['hideit']), 'NotEmpty')) {
                    $error = true;
                }

                /**************************************************************/
                $fileName = '';
                if (isset($_FILES['attachment']['name']) && $_FILES['attachment']['name'] != '') {
                    try {
                        $fileName       = $_FILES['attachment']['name'];
                        $fileExt        = strtolower(substr(strrchr($fileName, ".") ,1));
                        $fileNamewoe    = rtrim($fileName, $fileExt);
                        $fileName       = preg_replace('/\s+', '', $fileNamewoe) . time() . '.' . $fileExt;
                        $uploader       = new Varien_File_Uploader('attachment');
                        $uploader->setAllowedExtensions(array('doc', 'docx','pdf','xls', 'xlsx','csv'));
                        $uploader->setAllowRenameFiles(false);
                        $uploader->setFilesDispersion(false);
                        $path = Mage::getBaseDir('media') . DS . 'contacts';
                        if(!is_dir($path)){
                            mkdir($path, 0777, true);
                        }
                        $uploader->save($path . DS, $fileName );
                    } catch (Exception $e) {
                        $error = true;
                    }
                }
                /**************************************************************/
 
                if ($error) {
                    throw new Exception();
                }
                $mailTemplate = Mage::getModel('core/email_template');
                /* @var $mailTemplate Mage_Core_Model_Email_Template */
 
                /**************************************************************/
                //sending file as attachment
                $attachmentFilePath = Mage::getBaseDir('media'). DS . 'contacts' . DS . $fileName;
                if(file_exists($attachmentFilePath)){
                    $fileContents = file_get_contents($attachmentFilePath);
                    $attachment   = $mailTemplate->getMail()->createAttachment($fileContents);
                    $attachment->filename = $fileName;
                }
                /**************************************************************/
 
                $mailTemplate->setDesignConfig(array('area' => 'frontend'))
                    ->setReplyTo($post['email'])
                    ->sendTransactional(
                        Mage::getStoreConfig(self::XML_PATH_EMAIL_TEMPLATE),
                        Mage::getStoreConfig(self::XML_PATH_EMAIL_SENDER),
                        Mage::getStoreConfig(self::XML_PATH_EMAIL_RECIPIENT),
                        null,
                        array('data' => $postObject)
                    );
 
                if (!$mailTemplate->getSentSuccess()) {
                    throw new Exception();
                }
 
                $translate->setTranslateInline(true);
 
                Mage::getSingleton('customer/session')->addSuccess(Mage::helper('contacts')->__('Your inquiry was submitted and will be responded to as soon as possible. Thank you for contacting us.'));
                $this->_redirect('*/*/');
                return;
            } catch (Exception $e) {
                $translate->setTranslateInline(true);
                Mage::getSingleton('customer/session')->addError(Mage::helper('contacts')->__('Unable to submit your request. Please, try again later'));
                $this->_redirect('*/*/');
                return;
            }
 
        } else {
            $this->_redirect('*/*/');
        }
    }
}

有限制了上传格式，及将附件保存在/media/contacts/

3. 完成Magneto联系我们上传文件 。测试了下能作为邮件的附件顺利发送。