Ok I booted to XP and exported the file. Copy the bold Print to notepad. Save as merge.reg
Import into the registry as discussed to restore merge .
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\regfile\shell]
[HKEY_CLASSES_ROOT\regfile\shell\edit]
[HKEY_CLASSES_ROOT\regfile\shell\edit\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00 ,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00 ,32,00,5c,00,4e,00,4f,00,\
54,00,45,00,50,00,41,00,44,00,2e,00,45,00,58,00,45 ,00,20,00,25,00,31,00,00,\
00
[HKEY_CLASSES_ROOT\regfile\shell\open]
@="Mer&ge"
[HKEY_CLASSES_ROOT\regfile\shell\open\command]
@="regedit.exe "%1"" (ปัญหาอยู่ตรงนี้เอง ของเรามันเป็น Notepad.exe)
[HKEY_CLASSES_ROOT\regfile\shell\print]
[HKEY_CLASSES_ROOT\regfile\shell\print\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00 ,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00 ,32,00,5c,00,4e,00,4f,00,\
54,00,45,00,50,00,41,00,44,00,2e,00,45,00,58,00,45 ,00,20,00,2f,00,70,00,20,\
00,25,00,31,00,00,00
ขอบคุณเพื่อนๆที่เข้ามาตอบในกระทู้ด้วยนะคะ