Ok this tutorial is rather good since it helps you out alot if you dont know how to edit a mrs file, or create a gunz runnable.
REQUIREMENTS
1 : A Gunz Client. I recommend the India Gunz version but since im confused if the runnable may work or not. I'd you go with the BR Client.You can update it if you want, won't matter.
2 : The latest and compatible Runnable files. You may use Rotana's runnable.
3 : MRS Unpacker. You would need it to unpack/pack your .MRS Files.
4 : Photoshop CS2 [ DO NOT USE CS3! CS3 SUKS! ]
4 : Photoshop DDS Utilities and Thumbnail DDS Viewer.
HOW TO CREATE A RUNNABLE
1 : Extract the Client and update it if possible.
2 : On the DESKTOP, right click your BR Gunz Client Shortcut and look up 'Target'.
3 : You will see something like "C:\Program Files\LevelUpGames\The Duel\theduel.exe"
4 : Edit the target and make it something like "C:\Program Files\LevelUpGames\The Duel\theduel.exe" /game "<map>" "debug" 0 0
5 : Rename <map> to the name of the map.
6 : For E.G., if you want the map to be Town, rename the target to "C:\Program Files\LevelUpGames\The Duel\theduel.exe" /game "town" "debug" 0 0
7 : Be sure that the MRS MAP file in your 'Maps' Folder of your client is in lower case. E.G., make it 'town' instead of 'Town' or it won't create a game.
USING THE RUNNABLE TO EDIT YOUR MAP OR ITEM
1 : Use the MRS unpacker provided by me and install the Photoshop utilities.
2 : Unpack the MRS files you wish to edit.
3 : Right click the .DDS files and open them with Photoshop.