NK.BIN Patcher
From t-hack.com - Hack X300T / X301T
NK Patcher is a C# GUI application that patches a NK.BIN file to allow unsigned applications to run outside of the windows folder (rom).
New Version
The following version is by Dark Neo, based on the original source code from isO-Mick, that adds support for disabling the Watchdog that monitors the TV2Client: