Currently, MarkdownPad doesn't support navigation to local files within the LivePreview pane. However, if you export the document as HTML or user the Preview in Browser feature (shortcut key:
F6), it will work.
If you're editing a document with the folder
test.txt in its same directory, just use the following syntax in your Markdown file:
If nested in a sub-directory, just add the subdirectory to the path:
These are obviously relative file paths; it may also be possible to accomplish the same functionality with absolute file paths (e.g.
file:/// hyperlinks), but I'm told that this functionality varies from browser-to-browser due to security concerns.