How to get acces to the 3D editor
1. Creat an folder in the ArmA main folder called "missionname"."mapname" for example Test.Altis.
2. Creat inside this folder a file called mission in biedi-format (mission.biedi)
3. Creat a shortcut of the arma3.exe
4. Open the shortcut properties and add after the arma3.exe filepath the filepath of the mission.biedi in ""
5. now only open the shortcut and you get acces to the editor
or only add the uplouded files in your arma3 foulder and lauch the short cut.