Navigating through folders on Mitsubishi M70

Greetings,
I have a simple question
How can I open a program which is in a folder using the input box. I attached an image to show what I meant from input box.
suppose I have a program called "sample" or "12345" than I search-select memory card and enter the programs name and in opens.
On the other hand if the program is in a folder in MD card such as "G:\CAMS\1234" and if I type "CAMS\1234" or things like that it does not open. Moreover if I want to open folder named "MOLDS" and I type folders name as input such as "MOLDS" or "MOLDS\", "G:\MOLDS\", it does not open.

How should I type to open a folder?Do I have to select folders everytime with arrow keys?
I do hope for the opposite...

Find attached image,
regards :)