FileAssistant was originally written by 71M and was then ported to run on Firmware 2.8 by Killer Maniac. It also includes 5 skins.
Note: Developer stated this was not throughly tested, please use at your own risk.
Unzip the two folders into your ms0:/PSP/GAME/ folder.
To run, start xLoader. Go to the game folder in your PSP's XMB, find FileAssistant and press Cross.
The mod is for Firmware 2.8 only and it was advised to use with caution since it was not properly tested whether or not Flash writing works.