[upload组件]windows下upload组件选取markdown文件无法获取其type信息

[sy0uta1k0n]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

4.2.5

Environment

windows, chrome

Steps to reproduce

1. 新建一个upload组件
2. 选取md后缀结尾文件
3. mac环境下可以正确识别type='text/markdown' , 同一个文件在windows下type=''
4. windows下右键文件属性, 其类型为Markdown File
5. 其他类型pdf, docx等均可正常识别, 目前仅发现md有这个问题

What is expected?

windows也能正确识别文件类型

What is actually happening?

windows下type为空字符串

[github-actions]

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