Okay, i just have to rewrite the guide all together, it ait very newbie friendly. Copy any thing of it to the first post.

This is how to make NES and GBA games open in the file-browser:

Short versions for people that are well known with linux:
Insert
at the bottom of
/usr/share/applications/defaults.list

Long version for Newbs:

First of all you need rootsh to do this. Get it here (note if your in the maemo browser you can install it directly from that site):
http://maemo.org/downloads/product/Maemo5/rootsh/
this is a shortened url that you can use to type into the maemo browser:
tinyurl.com/rootsh

You need to find the X-terminal if you know how to do this, go a head and open it, if not here is how. Open the main menu, at the desktop it opens with the button at the top left of the screen, press it again if the application switcher appears. Press others, and chose X Terminal.

in here type these commands
this step is required for noobs, it backs up the file you are soon going to edit.
Now you need vim installed, this command does not hurt anything if you all ready have it install.
press y or yes on the keyboard if it asks

now we are going to edit the file
now we are inside vim, i dont really like this text editor because its hard to navigate and do stuff, ill walk you through it, do this on the hardware keyboard.

press the right and down button multiple times till your at the end of the document. When your at the end of the last line press the "o" button, this is o for Oscar (dont hold shift while you do this).
Now press the Linebreak key, the enter key that is. And write in this

its important that these lines are on two separate lines, and for simplicity sake we put them on the bottom of the text file.

now press the "esc" button on the bottom of the screen and now we need to save properly. to do this simply write

and then hit enter.

This should work instantly, start playing!