This file is a "dependency" for several arcade titles. If you try to run these games without it, the emulator will report a missing file error. Key games include: Macross / Super Spacefortress Macross Bio-ship Paladin (also known as Uchuu Senkan Gomora Thunder Dragon 3. Usage in Emulation (MAME) File Placement : To resolve errors, the nmk004.zip (containing nmk004.bin ) should be placed in your emulator's folder alongside the actual game zip files. Romset Versioning