Thank you drifty0pine!
The first solution, it´s works!
[a relative link](../../some/dir/filename.md)
[Link to file in another dir on same drive](/another/dir/filename.md)
[Link to file in another dir on a different drive](/D:/dir/filename.md)
but I had need put more ../
until the folder where was my file, like this:
[FileToOpen](../../../../folderW/folderX/folderY/folderZ/FileToOpen.txt)