REGEDIT4
 
[HKEY_CLASSES_ROOT\*\shell\DevKit Advance Here\command]
@ = "cmd.exe /q /k echo DevKit Advance R5 Beta 3 -- http://devkitadv.sourceforge.net/&&set DEVKITADV=c:\\devkitadv-r5-beta-3&&call c:\\devkitadv-r5-beta-3\\bin\\agb-crtenv&&call c:\\devkitadv-r5-beta-3\\user"

[HKEY_CLASSES_ROOT\Directory\shell\DevKit Advance Here\command]
@ = "cmd.exe /q /k cd %L&&echo DevKit Advance R5 Beta 3 -- http://devkitadv.sourceforge.net/&&set DEVKITADV=c:\\devkitadv-r5-beta-3&&call c:\\devkitadv-r5-beta-3\\bin\\agb-crtenv&&call c:\\devkitadv-r5-beta-3\\user"