there is a forum that made metal slug work on neo4ll_aes i don't understand text below:
Ok, nobody replied, so I suppose that GFX files are NOT roms (they cannot be used without the rom) and I am NOT posting any links to warez/rom sites, so I hope the mods won't ban me. I made a package of GFX dumps and .rc files for Metal slug 3,4,5. Other games in the series run fine, so I did not include anything else in the package. To run Metal Slug 4,5 find roms with the EXACT contents as said in the appropriate .rc file. To get Metal Slug 3 to work find 2 archives - mslug3.zip and mslug3n.zip. The latter one should contain should be no more that 2MB in size and contain two files - 256-ph1.rom and 256-ph2.rom. Move these files into the mslug3.zip and rename mslug3.zip to mslug3n.zip and move it to your roms directory. You're done! Enjoy!
DOWNLOAD LINK:
http://www.mediafire.com/?yzojydzzodn
lINK: https://pyra-handheld.com/boards/threads/metal-slug-3-4-5.47686/