From Forum Nokia Wiki

ID	KIS000385	Creation date	July 7, 2006
Platform	S60 1st Edition S60 2nd Edition	Devices
Category		Subcategory

Keywords (APIs, classes, methods, functions):

Description

.mdl recognizer DLLs, installed under \system\recogs, should not have file names longer than 16 characters (including the extension). A recognizer with a longer filename may fail to load or cause the device to lock up during startup.
Note that pressing and holding the Edit (pen) key during startup will prevent add-on recognizers (and other autostart items) from being loaded. This may help in situations where the device cannot start normally due to a malfunctioning recognizer.