[Admins]

I would say

FILE GraalEditor.exe
FILE bass.dll
FILE commands.rtf
FILE headsconfig.txt
FILE levels/tiles/pics1.png
FILE tileobjects/objectsCastle.txt
FILE tileobjects/objectsHouse Inside.txt
FILE tileobjects/objectsSnow.txt
FILE tileobjects/objectsStandard.txt
FILE tileobjects/objectsVolcano.txt

for the Editor, and

FILE GraalShop.exe
FILE soundicon.png

for the GraalShop.
There might be some more files you need for actually playing offline, like the ganis. They are still available at http://www.graalonline.com/graal2001/pack_editor/<filename> etc. (you need to type the full path)