I think its called Ued...UnrealEditor, I already have 3ds and on ued's website it sais it will work with 3ds but i dont no were to download Ued. lol that was a little confusing but tyvm to anyone who can tell me or tries :D
Most games on Unrealengine 2 ship with UEd3, UT2k4 for instance. In this case you will find the editor in the game's "system" folder as "unrealed.exe" or something. Republic Commando's Editor only comes with the first patch. Once you updated the game it will be in LucasArtsStar Wars Republic CommandoGameDataSystemUnrealEd.exe
TVVVM i downloaded the first patch found it. :D