`fread()` doesn't support unicode in file names on Windows

我刚刚开始尝试使用datatable，发现如果文件中含有中文路径，将会出现IOError。
然而同一个文件，在全英文路径下则不会出现这样的问题。
报错信息附在最后。
我不知道，是否已存在了解决方案，我尝试搜过，但没有找到解决方案。

My English is not good. I use machine translation:
---
I just tried to use datatable, and found that if the file contains a Chinese path, an IOError will appear.
However, for the same file, this problem will not occur in the full English path.
The error information is attached at the end.
I don't know whether there is a solution. I tried to search, but I didn't find a solution.
```
IOError Traceback (most recent call last)
in

IOError: Unable to obtain size of D:/测试.csv: [errno 2] No such file or directory
```