如果文件存在于路径中，我想在输入类型中设置自动选择的文件

I want to set file automatically loaded if exist file in local defined default path. here is the code

<form action="" method="POST" enctype="multipart/form-data">
<input type="file" name="hard_file" >
<input type="submit" name="submit" class="submit">

all you have to do is follow this post

How to set a value to a file input in HTML?

In there is a reazon for what that is not permitted:

You cannot due to security reasons.

Imagine:

<form name="foo" method="post" enctype="multipart/form-data">
    <input type="file" value="c:/passwords.txt">
</form>
<script>document.foo.submit();</script>

You don't want the websites you visit to be able to do this, do you? =)