TN.232.Strip _OpenResFile...- This Technical Note discusses a bug in _OpenResFile and _OpenRFPerm which can cause system crashes and what you can do to avoid this problem. The traps _OpenResFile and _OpenRFPerm call some common code in 128K and later ROMs which was affected by some system patches for early print drivers. The problem is that the common code checks an attribute bit in the pointer to the string name to see if it is a dereferenced handle.