Instructions
Click the "Start" button and select "Computer."
Go to the "Combat Arms" folder on your hard drive. The default location for "Combat Arms" is the "C:\Nexon\Combat Arms\" folder.
Double-click the "Combat Arms" folder. Select the "Game" folder, then open the "BGM" folder. Locate the "BGM_LOOP.mp3" and "UIBGM_LOOP.mp3" files. The former file is the new theme song, while the latter is the old one.
Right-click the "BGM_LOOP.mp3" file and select "Rename." Change the name of the file to "NewBGM_LOOP.mp3" or something similar. Rename the "UIBGM_LOOP.mp3" file to "BGM_LOOP.mp3."