Thanks
Decide what you want it to do, think roughly what you want it to look like and then decide how you are going to do it.
I have never coded a file manager in DroidScript but I did at one time use a file-explorer I coded myself.
There is a blog-post I wrote less than a month after I had discovered DroidScript ( that was not its name then ) so remember, this was written by a beginner with what is now a very old version of DroidScript.
I have no idea whether the code will still run or what it looks like if it does. I expect the app design is embarrassing.
But it may help you think about what you want.
http://androidscriptkiddy.blogspot.co.uk/2014/08/coding-file-explorer.html
This sample may help.
http://wiki.droidscript.me.uk/doku.php?id=sample_code:folder_picker
Thanks for your help.