Link to a *.md file in another folder

I'm using this wonderful app to manage my wki-like notes.

If I click the link to a markdown file in the current directory, the file is opened in the new window. However, if the link to the file in another directory, it shows "can't find the file.." message.

The link is just like...

```
[title](another_folder/title.md)
```

Thanks.

No file, test, or entry point is named in the issue. Reproduce the failure in MacDown with a link such as [title](another_folder/title.md), then trace how relative Markdown links are resolved; done means a link to a Markdown file in another folder opens instead of showing the file-not-found message.

Written by the indexing model from the issue text.